Teflon.Djinn: I just moments ago purchased Defcon via the 5 for $10 promotion here on GoG. I proceeded to download and install the OS X version of the game, but upon running the application, I was greeted with a 'Key Invalid' error. A screenshot of this can be seen here.

It looks like whatever the key was supposed to be, it was corrupted somehow. I have tried redownloading and reinstalling.

I also tried inputing the key listed on my user page - But this only gives me an "Authentication Status: Unknown" error.

Any help would be appreciated.