Check product key update process

[rgatkinson]

No description provided.

[rgatkinson]

Well, we can't seem to make a new version auto-uninstall an old one. But we DO know that if we keep the productcode's the same that user's will be forced to do that manually. That at least lets us defer solving this problem entirely until a future release.

[rgatkinson]

This seems relevant:

http://xombe.com/2013/08/28/visual-studio-installer-doesnt-uninstall-previous-version/

https://social.msdn.microsoft.com/Forums/windows/en-US/9ce5da29-3f37-4e7f-a548-1cbeb4a3e0a3/removepreviousversionstrue-but-previous-version-is-not-removed-from-the-target-machine?forum=winformssetup

https://msdn.microsoft.com/en-us/library/aa370859(v=vs.85).aspx