Well to start with make sure the version of the trainer matches the patched version of the game your using. I also found that although the readme file says you can put the trainer .exe file anywhere on your drive, F6 worked, but I wasn't able to get the other "F" keys to work until I put it in the game directory.
If you use the Invul... cheat, heres a suggestion for those of us that really hate to see our units at half or less health. For Vehicles just build them and way point them within the repairing radius of the War Factory, once built use the "F" key to activate cheat, then let the war factory repair them, as well as Airbases with Aircraft,(GDI & Nod), and they keep their cheat stats, same with infantry, send them to the armory for GDI Sorry Nod has none that I know of. GDI and NOD Buildings can be repaired with a Engineer or Saboteur. Although this is not game breaking, it does present the illusion of normalcy....lol
BTW, Thanks for all the hard work on the trainers, excellent program.
Question: Are there any plans of a Unit and Buildings editor? Like the old C&C ini editors like Red Alchemist planned for the future if it's even possible.