I see. Oh well, it's my fault that I am late to the party.
Make sure you have the Gathering Storm DLC enabled, and activate the trainer in-game when you can move units around. in the campaign.
It's retired for the same reason that is present on this thread. People don't read the instructions and incessantly post it's not working, when the trainer is STILL working fine. They just aren't reading the instructions nor the postings in 100 places telling them why they can't get it to work.
this just reinforces my decision to leave retired. Because, the trainer still works, and people still won't read the directions, the sticky, the readme in the trainer, the 100 times we posted over and over why the are getting the error.
THE TRAINER IS FOR GATHERING STORM DLC ENABLED GAMES ONLY.