I have exactly the same problem. Incidentally, I have the same problem with Expeditions: Viking, so I'm fairly certain that it's the Windows update that broke them. Very frustrating.
This is the second update that I haven't been able to install directly. Last time, I had to uninstall and re-download the whole thing to install the game. It's probably because I install on a secondary partition (non-standard location), but it's really frustrating to have to download a 3.2GB installer because the patcher won't work right.
I had the same problem just now in a game as Resoln. The Spell of Making happened to complete on the same turn that I got a "World Achievement". It looked like it started to do the "you win!" series of events, but then popped up the "World Achievement" box. So now I have to win another way...although I guess I can just cast it again...