extension cannot be loaded

[clanganke]

Using EasyEDA Standard 6.5.23 under Windows, I cannot load the extension.

AFAIU it should be the directory containing manifest.json that all files
should be selected from for loading the extension

However loading all
files from the directory
easyeda-ibom-extension-0.1.2\src\platform
yields the error message (translated by me...)
One or more js files not found

On loading all files from the directory
easyeda-ibom-extension-0.1.2\src
instead I receive an error msessage like
manifest.json not found
same for the directory
easyeda-ibom-extension-0.1.2

What am I possibly missing or doing wrong?