There was a set of tools for 1.1 and a set of tools for the final release. One set is named AngelBeats_1stBeat_Trial_Tools and one is named AngelBeats_1stBeat_Tools.
If you’re running 1.1, and the 1.1 tools aren’t working, I tell you what’s wrong.
Just in case, the ABFBT git only includes files from the full release of the game, so they may not be compatible with the trial. You’d have to port the translations over to your game manually I’d imagine.