I did the upgrade today, and got two unwanted programs along with it. One was easy to get rid of. Regular uninstall worked. The other, Chromium, was not. The danger is that Chromium can and has been manipulated with Adware and Malware. I don't know for sure this one was, but I was taking no chances, especially since it had been configured to NOT have uninstall work. VERY suspicious.
If anyone has this and would like to remove it:
Malwarebytes got most of it. The installation also makes it a startup program, so I had to turn that off and restart before I could manually remove the folder. Another bit of nastiness was that it was installed in the user directory, so a simple system restore wouldn't work.
I ran regedit. There seemed to be no lasting influence there.
Further beware: I use Chrome and this install put some extensions there as well. Chrome will notify you of this. Just tell it not to activate them. Oh, Malwarebytes took care of those as well.
I tried going to NOX to complain, but was stymied.