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The trainer was updated 4 days ago.
- Make sure you’re using a legitimately purchased Uplay version of the game.
- Make sure you’re using the most up-to-date trainer by clicking “History” in the far right of the trainer under the Play button.
- Run GRB.exe as an admin. - Follow the steps in this post: Ghost Recon Breakpoint Cheats and Trainer for Uplay - #1072 by chrisoblake92
That’s exactly the cause of your issue. The trainer was made for the Uplay game, which is different from the Epic game.
Use the trainer made specifically for the Epic Games version: Ghost Recon Breakpoint Cheats and Trainer for Epic Games