I confirm! Trainer with the patch version 1.15.a works fine
Something's blocking it. If the version matches, try putting it in the game folder with the SE3 Exe file. Either disable your AV and firewall or add it to the Exclusion list. Run trainer As Admin.
I am guessing you missed the "STATUS: RETIRED" next to the trainer. They will not post anymore updates for this game as it has been retired.