I see a lot of misunderstanding of FAB customers regarding the requirement of Plugins to be Per-Seat only and the need to purchase more than one license, if the project / studio has multiple people working on it - as can be seen in FAB EULA Section 2 E.
Apparently the wording of the “personal” and “professional” license, when selecting, makes some people believe this is a shared license and only requires one purchase.
I would suggest to either change the text for the personal & professional license, when the asset is a plugin.
Or, probably easier, to display a clear warning above or below the license selection box, noting about the per-seat requirement for plugins, with a link to the EULA.