If it worked anyway, good; if it didn't, but the game still works, oh well; if it didn't, and it screwed up your save, sucks.
The FM database is different from other versions this year, it even appears to be different with the amount of leagues available in your game. It's hard to get a programme coded right to pick up these differences, and there is no release version of any unofficial editor because of that. You use them at your own risk, and it's good if they work. Not much to be done if they don't.