Did you install our plugins by copying files through FTP?
I think that your plugins folder has too restrictive CHMOD restrictions.
You can change file and folders permissions through FTP.
Alternatively, you can download our plugin and add-ons as zip files, then connect to your FTP, delete any customer-area* folder, and re-upload extracted zip files to the plugins folder.
Then activate the main plugin. Make sure it doesn’t throw any error, then re-activate the add-ons one by one.
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