It seems that uninstalling PT7.5 can delete PT8 user settings.
When I uninstalled PT7.5 on a user’s computer just now, I ticked (checked) the box when asked the question whether I wanted to delete user settings. I assumed that this would only delete user settings for PT7, but in fact it wiped all the v8 settings.
Is this a bug? If not, then the description of the tick-box (checkbox) should make it clear that choosing it will delete user settings for all versions of PT (or whatever wording reflects the actual consequences).
BTW, before 7.5, I had uninstalled 7.6. I don’t think I was asked the same question during that uninstall, but I can’t be sure.