I am running the 64-bit version of the exe and I have all of the DLC.
No update activity from Steam since the trainer was made, if the version is still 1.1.8.0 for both, then it would be best to create a support ticket so we can look into it a little further.
I'm having the following problem with this trainer: Every time that I run it, it says that it is the Assassin's Creed Black Flag trainer. Even when I delete, download, and extract the new file, the trainer does the same thing. Other trainers do not give me this error, just this trainer.
Just tried it and it is the right trainer for me Link, was this direct from website or using Trainer Manager?
The trainer won't launch. It asks for an "app" to open it. Does the trainer include the Crucible DLC?
Its either your security software or you need to reset your Win 10 default apps.
How to reset your Windows 10 default Apps.
Link
Extract trainer and make sure trainer/launcher/editor is in a folder excluded from virus scans. Empty quarantine folder if needed or set anything trainer related (paths and EXE's) to ALLOW. Disable any Live/Active/Real-Time tools which may trigger false positives in security software which may terminate the game/trainer when it's activated or options used.
C:\Users\USERNAMEHERE\Cheathappens
may need to be added to exclusions as well. Run trainer as admin, read the instructions and try again.
Anti-virus help page. Link