Bought and downloaded from Steam. I have tried starting it two different ways on Steam, through the Start menu and after going to local content and clicking the launcher app. All it does is give me the thinking donut and that is it. I have been able to get the launcher method to work but it only shows up as the demo version. I have tried reentering the serial key in the regedit and didn't change anything. I have also deleted local content and uninstalling from the local content, twice. Any other suggestions?
Thanks

Disregard, I was able to finally get the register screen to open. The key was missing a letter.