This thread is resolved. Here is a description of the problem and solution.
Problem:Unable to register WPML, commercial tab is empty
Solution:This error is happening due to the repositories.xml missing from /vendor/otgs/installer.
Go to wp-content\plugins\sitepress-multilingual-cms\vendor\otgs\installer using FTP and from place the repositories.xml file .
You should be able to get the repositories file from within
Once thats done you need to press "Check for updates"
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