While using the Extension Manager Application (developed by xWiki team) to manage the extensions, I have noticed a bug under "Licenses" tab under the extension.

Buttons "get trial", "buy" and "Auto upgrade" seem to be broken (nothing happens on click).

After some investigation I suspect the problem is on this line of code (minimized version from browser debugger):

0 < a('#licenseManager-display td.type').size()

Problem in this line is that .size method has been removed in jQuery 3.0. and was replaced with .length.

source: https://api.jquery.com/size/

This solution uses jQuery +3.0 (3.7.1 I believe?) so I suspect this could be the issue why the buttons are broken.

This is the file that was inspected for this issue:

Visual of the "License" page with broken buttons visible: