This may be normal, the ProDAD extra has 2 so I was able to install on both laptop and PC.

I unstalled Boris from my laptop as it could cause problems if a project had it in use on one machine, then I couldn't use the same project on my other machine without paying for an extra licence.

Maybe its mentioned somewhere, if not then Magix should be up front with the licence uses for their add-ons packages, simpler and more transparent that way.