I know this is not directly VP15 related, but I think all BorisFX users have to watch out, so I choose this forum category to spread the word:

If you have installed older BorisFX suites like I have (BCC8), the free Boris Continuum Image Restoration Suite Installer (V11) that comes with VP15 will update/overwrite and deactivate all your working and licensed older Boris plugins without prompting. I had to deinstall all V11 plugins, deinstall all V8 plugins and then reinstall all V8 plugins to get my system up and running again. Obviously there is no way to use older BorisFX plugins in parallel to the new versions.