diff --git a/CHANGELOG.md b/CHANGELOG.md
index 73047de..00814e4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,16 @@
+### Date:       2021-March-09
+### Release:    v2021030901
+
+#### :wrench: Fixes and enhancements
+
+---
+
+#### Intro files no longer prevent submissions
+
+As of our last release, a bug caused when attaching an intro file to a submission prevented students from submitting. We have fixed this bug as a matter of urgency, and the intended functionality has been restored.
+
+---
+
 ### Date:       2021-March-02
 ### Release:    v2021030201
 
diff --git a/amd/build/eula_response.min.js b/amd/build/eula_response.min.js
index 1e1fadb..f1342c4 100644
--- a/amd/build/eula_response.min.js
+++ b/amd/build/eula_response.min.js
@@ -1,2 +1,2 @@
-define ("plagiarism_turnitinsim/eula_response",["jquery","core/str"],function(a,b){return{eulaResponse:function eulaResponse(){a(document).ready(function(){a("input[name=submitbutton]").prop("disabled","disabled")});a(document).on("click","#pp-eula-accept",function(){a("input[name=submitbutton]").prop("disabled","");a.ajax({type:"POST",url:M.cfg.wwwroot+"/plagiarism/turnitinsim/ajax/eula_response.php",dataType:"text",data:{action:"accept_eula",sesskey:M.cfg.sesskey},success:function success(){b.get_string("eulaaccepted","plagiarism_turnitinsim").done(function(c){a(".turnitinsim_eulacontainer").hide().html(c).fadeIn();b.get_string("submissiondisplaystatus:queued","plagiarism_turnitinsim").done(function(b){a(".tii_status_text").html(b)})})}})});a(document).on("click","#pp-eula-decline",function(){b.get_string("euladeclined","plagiarism_turnitinsim").done(function(b){a(".turnitinsim_eulacontainer").hide().html(b).fadeIn()});a("input[name=submitbutton]").prop("disabled","")})}}});
+define ("plagiarism_turnitinsim/eula_response",["jquery","core/str"],function(a,b){return{eulaResponse:function eulaResponse(){a(document).ready(function(){if(a("#turnitinsim_eulacontainer").length){a("input[name=submitbutton]").prop("disabled","disabled")}});a(document).on("click","#pp-eula-accept",function(){a("input[name=submitbutton]").prop("disabled","");a.ajax({type:"POST",url:M.cfg.wwwroot+"/plagiarism/turnitinsim/ajax/eula_response.php",dataType:"text",data:{action:"accept_eula",sesskey:M.cfg.sesskey},success:function success(){b.get_string("eulaaccepted","plagiarism_turnitinsim").done(function(c){a(".turnitinsim_eulacontainer").hide().html(c).fadeIn();b.get_string("submissiondisplaystatus:queued","plagiarism_turnitinsim").done(function(b){a(".tii_status_text").html(b)})})}})});a(document).on("click","#pp-eula-decline",function(){b.get_string("euladeclined","plagiarism_turnitinsim").done(function(b){a(".turnitinsim_eulacontainer").hide().html(b).fadeIn()});a("input[name=submitbutton]").prop("disabled","")})}}});
 //# sourceMappingURL=eula_response.min.js.map
diff --git a/amd/build/eula_response.min.js.map b/amd/build/eula_response.min.js.map
index c004984..a820c02 100644
--- a/amd/build/eula_response.min.js.map
+++ b/amd/build/eula_response.min.js.map
@@ -1 +1 @@
-{"version":3,"sources":["../src/eula_response.js"],"names":["define","$","str","eulaResponse","document","ready","prop","on","ajax","type","url","M","cfg","wwwroot","dataType","data","action","sesskey","success","get_string","done","text","hide","html","fadeIn"],"mappings":"AA4BAA,OAAM,wCAAC,CAAC,QAAD,CAAW,UAAX,CAAD,CAAyB,SAASC,CAAT,CAAYC,CAAZ,CAAiB,CAC5C,MAAO,CACHC,YAAY,CAAE,uBAAW,CACrBF,CAAC,CAACG,QAAD,CAAD,CAAYC,KAAZ,CAAkB,UAAW,CACzBJ,CAAC,CAAC,0BAAD,CAAD,CAA8BK,IAA9B,CAAmC,UAAnC,CAA+C,UAA/C,CACH,CAFD,EAIAL,CAAC,CAACG,QAAD,CAAD,CAAYG,EAAZ,CAAe,OAAf,CAAwB,iBAAxB,CAA2C,UAAW,CAClDN,CAAC,CAAC,0BAAD,CAAD,CAA8BK,IAA9B,CAAmC,UAAnC,CAA+C,EAA/C,EAGAL,CAAC,CAACO,IAAF,CAAO,CACHC,IAAI,CAAE,MADH,CAEHC,GAAG,CAAEC,CAAC,CAACC,GAAF,CAAMC,OAAN,CAAgB,gDAFlB,CAGHC,QAAQ,CAAE,MAHP,CAIHC,IAAI,CAAE,CAACC,MAAM,CAAE,aAAT,CAAwBC,OAAO,CAAEN,CAAC,CAACC,GAAF,CAAMK,OAAvC,CAJH,CAKHC,OAAO,CAAE,kBAAW,CAChBhB,CAAG,CAACiB,UAAJ,CAAe,cAAf,CAA+B,wBAA/B,EAAyDC,IAAzD,CAA8D,SAASC,CAAT,CAAe,CACzEpB,CAAC,CAAC,4BAAD,CAAD,CAAgCqB,IAAhC,GAAuCC,IAAvC,CAA4CF,CAA5C,EAAkDG,MAAlD,GAEAtB,CAAG,CAACiB,UAAJ,CAAe,gCAAf,CAAiD,wBAAjD,EAA2EC,IAA3E,CAAgF,SAASC,CAAT,CAAe,CAC3FpB,CAAC,CAAC,kBAAD,CAAD,CAAsBsB,IAAtB,CAA2BF,CAA3B,CACH,CAFD,CAGH,CAND,CAOH,CAbE,CAAP,CAeH,CAnBD,EAqBApB,CAAC,CAACG,QAAD,CAAD,CAAYG,EAAZ,CAAe,OAAf,CAAwB,kBAAxB,CAA4C,UAAW,CACnDL,CAAG,CAACiB,UAAJ,CAAe,cAAf,CAA+B,wBAA/B,EAAyDC,IAAzD,CAA8D,SAASC,CAAT,CAAe,CACzEpB,CAAC,CAAC,4BAAD,CAAD,CAAgCqB,IAAhC,GAAuCC,IAAvC,CAA4CF,CAA5C,EAAkDG,MAAlD,EACH,CAFD,EAIAvB,CAAC,CAAC,0BAAD,CAAD,CAA8BK,IAA9B,CAAmC,UAAnC,CAA+C,EAA/C,CACH,CAND,CAOH,CAlCE,CAoCV,CArCK,CAAN","sourcesContent":["// This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * Javascript controller for handling the EULA response.\n *\n * @package   plagiarism_turnitinsim\n * @copyright 2018 Turnitin\n * @author    John McGettrick <jmcgettrick@turnitin.com>\n * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\n\n/**\n * @module plagiarism_turnitinsim/handleEulaResponse\n */\n\ndefine(['jquery', 'core/str'], function($, str) {\n    return {\n        eulaResponse: function() {\n            $(document).ready(function() {\n                $('input[name=submitbutton]').prop('disabled', 'disabled');\n            });\n\n            $(document).on('click', '#pp-eula-accept', function() {\n                $('input[name=submitbutton]').prop('disabled', '');\n\n                // Hide the EULA link.\n                $.ajax({\n                    type: \"POST\",\n                    url: M.cfg.wwwroot + \"/plagiarism/turnitinsim/ajax/eula_response.php\",\n                    dataType: \"text\",\n                    data: {action: \"accept_eula\", sesskey: M.cfg.sesskey},\n                    success: function() {\n                        str.get_string('eulaaccepted', 'plagiarism_turnitinsim').done(function(text) {\n                            $('.turnitinsim_eulacontainer').hide().html(text).fadeIn();\n\n                            str.get_string('submissiondisplaystatus:queued', 'plagiarism_turnitinsim').done(function(text) {\n                                $('.tii_status_text').html(text);\n                            });\n                        });\n                    }\n                });\n            });\n\n            $(document).on('click', '#pp-eula-decline', function() {\n                str.get_string('euladeclined', 'plagiarism_turnitinsim').done(function(text) {\n                    $('.turnitinsim_eulacontainer').hide().html(text).fadeIn();\n                });\n\n                $('input[name=submitbutton]').prop('disabled', '');\n            });\n        }\n    };\n});"],"file":"eula_response.min.js"}
\ No newline at end of file
+{"version":3,"sources":["../src/eula_response.js"],"names":["define","$","str","eulaResponse","document","ready","length","prop","on","ajax","type","url","M","cfg","wwwroot","dataType","data","action","sesskey","success","get_string","done","text","hide","html","fadeIn"],"mappings":"AA4BAA,OAAM,wCAAC,CAAC,QAAD,CAAW,UAAX,CAAD,CAAyB,SAASC,CAAT,CAAYC,CAAZ,CAAiB,CAC5C,MAAO,CACHC,YAAY,CAAE,uBAAW,CACrBF,CAAC,CAACG,QAAD,CAAD,CAAYC,KAAZ,CAAkB,UAAW,CACzB,GAAIJ,CAAC,CAAC,4BAAD,CAAD,CAAgCK,MAApC,CAA4C,CACxCL,CAAC,CAAC,0BAAD,CAAD,CAA8BM,IAA9B,CAAmC,UAAnC,CAA+C,UAA/C,CACH,CACJ,CAJD,EAMAN,CAAC,CAACG,QAAD,CAAD,CAAYI,EAAZ,CAAe,OAAf,CAAwB,iBAAxB,CAA2C,UAAW,CAClDP,CAAC,CAAC,0BAAD,CAAD,CAA8BM,IAA9B,CAAmC,UAAnC,CAA+C,EAA/C,EAGAN,CAAC,CAACQ,IAAF,CAAO,CACHC,IAAI,CAAE,MADH,CAEHC,GAAG,CAAEC,CAAC,CAACC,GAAF,CAAMC,OAAN,CAAgB,gDAFlB,CAGHC,QAAQ,CAAE,MAHP,CAIHC,IAAI,CAAE,CAACC,MAAM,CAAE,aAAT,CAAwBC,OAAO,CAAEN,CAAC,CAACC,GAAF,CAAMK,OAAvC,CAJH,CAKHC,OAAO,CAAE,kBAAW,CAChBjB,CAAG,CAACkB,UAAJ,CAAe,cAAf,CAA+B,wBAA/B,EAAyDC,IAAzD,CAA8D,SAASC,CAAT,CAAe,CACzErB,CAAC,CAAC,4BAAD,CAAD,CAAgCsB,IAAhC,GAAuCC,IAAvC,CAA4CF,CAA5C,EAAkDG,MAAlD,GAEAvB,CAAG,CAACkB,UAAJ,CAAe,gCAAf,CAAiD,wBAAjD,EAA2EC,IAA3E,CAAgF,SAASC,CAAT,CAAe,CAC3FrB,CAAC,CAAC,kBAAD,CAAD,CAAsBuB,IAAtB,CAA2BF,CAA3B,CACH,CAFD,CAGH,CAND,CAOH,CAbE,CAAP,CAeH,CAnBD,EAqBArB,CAAC,CAACG,QAAD,CAAD,CAAYI,EAAZ,CAAe,OAAf,CAAwB,kBAAxB,CAA4C,UAAW,CACnDN,CAAG,CAACkB,UAAJ,CAAe,cAAf,CAA+B,wBAA/B,EAAyDC,IAAzD,CAA8D,SAASC,CAAT,CAAe,CACzErB,CAAC,CAAC,4BAAD,CAAD,CAAgCsB,IAAhC,GAAuCC,IAAvC,CAA4CF,CAA5C,EAAkDG,MAAlD,EACH,CAFD,EAIAxB,CAAC,CAAC,0BAAD,CAAD,CAA8BM,IAA9B,CAAmC,UAAnC,CAA+C,EAA/C,CACH,CAND,CAOH,CApCE,CAsCV,CAvCK,CAAN","sourcesContent":["// This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * Javascript controller for handling the EULA response.\n *\n * @package   plagiarism_turnitinsim\n * @copyright 2018 Turnitin\n * @author    John McGettrick <jmcgettrick@turnitin.com>\n * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\n\n/**\n * @module plagiarism_turnitinsim/handleEulaResponse\n */\n\ndefine(['jquery', 'core/str'], function($, str) {\n    return {\n        eulaResponse: function() {\n            $(document).ready(function() {\n                if ($(\"#turnitinsim_eulacontainer\").length) {\n                    $('input[name=submitbutton]').prop('disabled', 'disabled');\n                }\n            });\n\n            $(document).on('click', '#pp-eula-accept', function() {\n                $('input[name=submitbutton]').prop('disabled', '');\n\n                // Hide the EULA link.\n                $.ajax({\n                    type: \"POST\",\n                    url: M.cfg.wwwroot + \"/plagiarism/turnitinsim/ajax/eula_response.php\",\n                    dataType: \"text\",\n                    data: {action: \"accept_eula\", sesskey: M.cfg.sesskey},\n                    success: function() {\n                        str.get_string('eulaaccepted', 'plagiarism_turnitinsim').done(function(text) {\n                            $('.turnitinsim_eulacontainer').hide().html(text).fadeIn();\n\n                            str.get_string('submissiondisplaystatus:queued', 'plagiarism_turnitinsim').done(function(text) {\n                                $('.tii_status_text').html(text);\n                            });\n                        });\n                    }\n                });\n            });\n\n            $(document).on('click', '#pp-eula-decline', function() {\n                str.get_string('euladeclined', 'plagiarism_turnitinsim').done(function(text) {\n                    $('.turnitinsim_eulacontainer').hide().html(text).fadeIn();\n                });\n\n                $('input[name=submitbutton]').prop('disabled', '');\n            });\n        }\n    };\n});"],"file":"eula_response.min.js"}
\ No newline at end of file
diff --git a/amd/src/eula_response.js b/amd/src/eula_response.js
index 237623a..745004c 100644
--- a/amd/src/eula_response.js
+++ b/amd/src/eula_response.js
@@ -30,7 +30,9 @@ define(['jquery', 'core/str'], function($, str) {
     return {
         eulaResponse: function() {
             $(document).ready(function() {
-                $('input[name=submitbutton]').prop('disabled', 'disabled');
+                if ($("#turnitinsim_eulacontainer").length) {
+                    $('input[name=submitbutton]').prop('disabled', 'disabled');
+                }
             });
 
             $(document).on('click', '#pp-eula-accept', function() {
diff --git a/db/upgrade.php b/db/upgrade.php
index fad110e..ff95f45 100644
--- a/db/upgrade.php
+++ b/db/upgrade.php
@@ -294,7 +294,7 @@ function xmldb_plagiarism_turnitinsim_upgrade($oldversion) {
         (new handle_deprecation)->unset_turnitinsim_use();
 
         $table = new xmldb_table('plagiarism_turnitinsim_sub');
-        $field = new xmldb_field('quizanswer', XMLDB_TYPE_CHAR, '32', null, false, null, null, 'tiiretrytime');
+        $field = new xmldb_field('quizanswer', XMLDB_TYPE_CHAR, '32', null, false, null, 0, 'tiiretrytime');
 
         if (!$dbman->field_exists($table, $field)) {
             $dbman->add_field($table, $field);
diff --git a/lang/da/plagiarism_turnitinsim.php b/lang/da/plagiarism_turnitinsim.php
index 69cdff9..548cbcb 100644
--- a/lang/da/plagiarism_turnitinsim.php
+++ b/lang/da/plagiarism_turnitinsim.php
@@ -25,4 +25,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['help_link'] = 'https://help.turnitin.com/da/integrity/administrator/moodle.htm#step-four';
+$string['help_link'] = 'https://help.turnitin.com/da/integrity/instruktor/moodle.htm';
diff --git a/lang/de/plagiarism_turnitinsim.php b/lang/de/plagiarism_turnitinsim.php
index 49a6503..8dc1fa2 100644
--- a/lang/de/plagiarism_turnitinsim.php
+++ b/lang/de/plagiarism_turnitinsim.php
@@ -25,4 +25,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['help_link'] = 'https://help.turnitin.com/de/integrity/administratoren/verwenden-von-turnitin-mit-moodle.htm#step-four';
+$string['help_link'] = 'https://help.turnitin.com/de/integrity/lehrkrafte/moodle.htm';
diff --git a/lang/en/plagiarism_turnitinsim.php b/lang/en/plagiarism_turnitinsim.php
index 0254b5c..573d88a 100644
--- a/lang/en/plagiarism_turnitinsim.php
+++ b/lang/en/plagiarism_turnitinsim.php
@@ -198,4 +198,4 @@
 $string['errorgettingsubmissioninfo'] = 'There was an error attempting to get the submission info.';
 $string['errorprocessingdeletedsubmission'] = 'This submission belongs to a deleted assignment and cannot be processed.';
 $string['errorquizattemptnotfound'] = 'The quiz attempt for this submission could not be found.';
-$string['help_link'] = 'https://help.turnitin.com/integrity/administrator/moodle.htm#step-four';
+$string['help_link'] = 'https://help.turnitin.com/integrity/instructor/moodle.htm';
diff --git a/lang/es_mx/plagiarism_turnitinsim.php b/lang/es_mx/plagiarism_turnitinsim.php
index 2d888e8..1df35df 100644
--- a/lang/es_mx/plagiarism_turnitinsim.php
+++ b/lang/es_mx/plagiarism_turnitinsim.php
@@ -25,4 +25,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['help_link'] = 'https://help.turnitin.com/es/integrity/administrador/moodle.htm#step-four';
+$string['help_link'] = 'https://help.turnitin.com/es/integrity/instructor/moodle.htm';
diff --git a/lang/fr/plagiarism_turnitinsim.php b/lang/fr/plagiarism_turnitinsim.php
index 5c60025..35c64e2 100644
--- a/lang/fr/plagiarism_turnitinsim.php
+++ b/lang/fr/plagiarism_turnitinsim.php
@@ -25,4 +25,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['help_link'] = 'https://help.turnitin.com/fr/integrity/administrateur/moodle.htm#step-four';
+$string['help_link'] = 'https://help.turnitin.com/fr/integrity/enseignants/moodle.htm';
diff --git a/lang/ja/plagiarism_turnitinsim.php b/lang/ja/plagiarism_turnitinsim.php
index f8af95d..15e8441 100644
--- a/lang/ja/plagiarism_turnitinsim.php
+++ b/lang/ja/plagiarism_turnitinsim.php
@@ -25,4 +25,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['help_link'] = 'https://help.turnitin.com/jp/integrity/管理者/moodle.htm#step-four';
+$string['help_link'] = 'https://help.turnitin.com/jp/integrity/講師用/moodle.htm';
diff --git a/lang/ko/plagiarism_turnitinsim.php b/lang/ko/plagiarism_turnitinsim.php
index b40fd14..866013b 100644
--- a/lang/ko/plagiarism_turnitinsim.php
+++ b/lang/ko/plagiarism_turnitinsim.php
@@ -25,4 +25,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['help_link'] = 'https://help.turnitin.com/ko/integrity/관리자/moodle.htm#step-four';
+$string['help_link'] = 'https://help.turnitin.com/ko/integrity/강사/moodle.htm';
diff --git a/lang/nl/plagiarism_turnitinsim.php b/lang/nl/plagiarism_turnitinsim.php
index f445164..a8724f9 100644
--- a/lang/nl/plagiarism_turnitinsim.php
+++ b/lang/nl/plagiarism_turnitinsim.php
@@ -25,4 +25,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['help_link'] = 'https://help.turnitin.com/nl/integrity/beheerder/moodle.htm#step-four';
+$string['help_link'] = 'https://help.turnitin.com/nl/integrity/docenten/moodle.htm';
diff --git a/lang/no/plagiarism_turnitinsim.php b/lang/no/plagiarism_turnitinsim.php
index e2bfe98..4af9eb1 100644
--- a/lang/no/plagiarism_turnitinsim.php
+++ b/lang/no/plagiarism_turnitinsim.php
@@ -25,4 +25,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['help_link'] = 'https://help.turnitin.com/nb/integrity/administrer/moodle.htm#step-four';
+$string['help_link'] = 'https://help.turnitin.com/nb/integrity/instruktor/moodle.htm';
diff --git a/lang/pt_br/plagiarism_turnitinsim.php b/lang/pt_br/plagiarism_turnitinsim.php
index 965a22d..9b31f52 100644
--- a/lang/pt_br/plagiarism_turnitinsim.php
+++ b/lang/pt_br/plagiarism_turnitinsim.php
@@ -25,4 +25,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['help_link'] = 'https://help.turnitin.com/pt-br/integrity/administrador/moodle.htm#step-four';
+$string['help_link'] = 'https://help.turnitin.com/pt-br/integrity/professor/moodle.htm';
diff --git a/lang/sv/plagiarism_turnitinsim.php b/lang/sv/plagiarism_turnitinsim.php
index 63e5a4c..7af8e22 100644
--- a/lang/sv/plagiarism_turnitinsim.php
+++ b/lang/sv/plagiarism_turnitinsim.php
@@ -25,4 +25,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['help_link'] = 'https://help.turnitin.com/sv/integrity/administrator/moodle.htm#step-four';
+$string['help_link'] = 'https://help.turnitin.com/sv/integrity/instruktorer/moodle.htm';
diff --git a/lang/zh_cn/plagiarism_turnitinsim.php b/lang/zh_cn/plagiarism_turnitinsim.php
index e605ddd..1bb0442 100644
--- a/lang/zh_cn/plagiarism_turnitinsim.php
+++ b/lang/zh_cn/plagiarism_turnitinsim.php
@@ -25,4 +25,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['help_link'] = 'https://help.turnitin.com/zh-hans/integrity/管理员身/moodle.htm#step-four';
+$string['help_link'] = 'https://help.turnitin.com/zh-hans/integrity/教师/moodle.htm';
diff --git a/lang/zh_tw/plagiarism_turnitinsim.php b/lang/zh_tw/plagiarism_turnitinsim.php
index 4fa6c5f..6be7cb0 100644
--- a/lang/zh_tw/plagiarism_turnitinsim.php
+++ b/lang/zh_tw/plagiarism_turnitinsim.php
@@ -25,4 +25,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['help_link'] = 'https://help.turnitin.com/zh-tw/integrity/管理員/moodle.htm#step-four';
+$string['help_link'] = 'https://help.turnitin.com/zh-tw/integrity/教師/moodle.htm';
diff --git a/lib.php b/lib.php
index aa4d69b..be9c88b 100644
--- a/lib.php
+++ b/lib.php
@@ -498,7 +498,7 @@ public function print_disclosure($cmid, $submissiontype = 'file') {
                 return html_writer::tag(
                     'div',
                     get_string('eulaalreadyaccepted', 'plagiarism_turnitinsim'),
-                    array('class' => 'turnitinsim_eulacontainer', 'id' => 'turnitinsim_eulacontainer')
+                    array('class' => 'turnitinsim_eulacontainer', 'id' => 'turnitinsim_eulaaccepted')
                 );
             }
 
@@ -506,7 +506,7 @@ public function print_disclosure($cmid, $submissiontype = 'file') {
                 return html_writer::tag(
                     'div',
                     get_string('eulanotrequired', 'plagiarism_turnitinsim'),
-                    array('class' => 'turnitinsim_eulacontainer', 'id' => 'turnitinsim_eulacontainer')
+                    array('class' => 'turnitinsim_eulacontainer', 'id' => 'turnitinsim_eulanotrequired')
                 );
             }
 
diff --git a/styles.css b/styles.css
index 8f52a39..7d2cc32 100644
--- a/styles.css
+++ b/styles.css
@@ -34,14 +34,19 @@
 }
 
 /* EULA */
-.turnitinsim_eulacontainer {
+.turnitinsim_eulacontainer,
+#turnitinsim_eulaaccepted,
+#turnitinsim_eulanotrequired {
     border: 1px solid #db4221;
     padding: 10px;
     text-align: center;
     margin-bottom: 10px;
 }
 
-.turnitinsim_eulacontainer #pp-eula-accept {
+.turnitinsim_eulacontainer,
+#turnitinsim_eulaaccepted,
+#turnitinsim_eulanotrequired,
+#pp-eula-accept {
     margin-right: 5px;
 }
 
diff --git a/version.php b/version.php
index 554de8c..3892d1f 100644
--- a/version.php
+++ b/version.php
@@ -25,7 +25,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version = 2021030201;
+$plugin->version = 2021030901;
 $plugin->release = "v1.2";
 $plugin->requires = 2017051500;
 $plugin->component = 'plagiarism_turnitinsim';