So the 'puter decided to do the Windows 10 Fall Creators Update. Afterwords Sonar didn't want to cooperate. It would only crash. I noticed, though, that Rapture Pro was weirding out on me, too. Re-installing Rapture Pro seemed to fix the Sonar problem. I also needed to re-install a couple other instruments, too. 
Passing this along in case anyone else has issues.
BTW, I still can't get my Sonar Professional out of Demo Mode. Back to using Sonar X3. 
John
 

Did you know you can get Home Studio for free right now? You could get by with that until they fix your issue. 
http://forum.cakewalk.com/Sonar-Home-studio-Giveaway-m3718858.aspx
 
 

Just for information next Windows build is due probably next month as my TEST PC has just installed the RC version.
Good news so far is that the install is a lot quicker than previous ones just as well as it was getting late.
 

I'm running Windows Pro set on business branch. So everybody will be testing it for me and I wont be getting it for some time.

I have the "Insider" Win 10 advanced version (currently OS Build 17074), along with my DAW production Win 10 Pro.  I have no problems with Sonar Plat on either Win 10 version.