Once you successfully patch CoH to an updated version (such as 1.71), download the trainer version that corresponds to the patch version.
Three step example for CoH version 1.40:
-Start with CoH version 1.00
1. Download the patch from Relic's website titled:
"Company of Heroes 1.00 - 1.40"
the downloaded file name could say "EN_100_140_Patch.exe"
-After successfully applying the patch, your CoH version should be 1.40
2. Download the CoH 1.40 trainer from cheathappens
3. Run the trainer, run the game
you forgot to put in that he'll need v1.4 No-CD/DVD fix to run the game.