since installing 1.5, have had a completely nonworking error generating ruined applescript scripteditor scriptrunner in my imac

i don't know how to fix all related to applescript -- lots of errors including 1750; don't have a clean backup since i did not know it was broken when backing up

and then need to downgrade back to what version? of 1.4.x? that still works properly on 10.4.11 ppc g5 imac

can anyone help? thanks