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I think i've figured it out. I started the game, got to an action part, alt-tab'd to my desktop and opened the trainer. Hit F1 from my desktop got the "Trainer Activated" and then got the pop up to update it. Waited a minute or 2 and got the new .dat file. I closed the game and the trainer. Reopened the trainer and restarted the game and it seemed to work.

andymutz posted the following from the previous thread, if you follow the instructions exactly the trainer will work

ok, i got this trainer working with the newest updates for the game. i tried it two times and the first time it didn't work, so maybe this detailed description of what i did, can be of help to anyone who also cannot get it working..
this is what i tried first:
delete CHLFD2.dat
launch trainer
launch game
start offline campaign
kill a few zombies
press F1
kill a few more zombies
quit the game
press OK to update the trainer
wait
press OK to quit the trainer
restart the trainer
restart the game
press F1 in the menu
start offline campaign
press desired option keys

now this method didn't work, the trainer options didn't get enabled.

so in my second attempt, i did the following:
delete CHLFD2.dat
launch trainer
launch game
start offline campaign
kill a few zombies
press F1
kill a few more zombies
press ALT+TAB to switch out of the game
press OK to update the trainer
wait
press OK to quit the trainer
switch back into the game
quit the game
restart the trainer
restart the game
press F1 in the menu
start offline campaign
press desired option keys

and now it works.

-andy-