I purchased the game from the official site about 4 weeks ago as a Digital Download. It was all working fine until I booted it up today (21/01/18 -UK format) and it asked me to input the key. When I did this, I noticed the 'Unlock Full Version' was greyed out and un-clickable. After pressing Esc multiple times, it just placed me into Demo mode.
I have proof of the purchase from the original site, and updating it has been unsuccessful so far. Anyone have a clue what's going on?