if 3+ people request an update then it gets moved to the queue..
Just filed the third update request with the details. Same issues recently reported: most recent trainer get "game not found," second most recent will not launch, oldest trainer gets Windows error when launched. Have tried all the suggestions (alt tabbing, running as admin, etc.).
Just FYI Anno 1401 is not available for purchase on Steam, so sounds like my best option is to get a refund for the GOG version and buy a retail copy.