That would be your call, I have yet to move to Win10.

Ok, so far I've reinstalled sonar plat, reinstalled melodyn, I still cant see melodyn in region fx or the plugin list within a track. Again guys. I'm not to savvy with this stuff.  I'ts a brand new studiocat machine with windows 10 AND SONAR PLATINUM. I'm coming from sonar 8.5.3. and windows xp.  

OK, I reinstalled sonar platinum, but this time I had to go to regedit and delete the platinum keys. all working great.