LateralGM Now acts as a Backwards Converter in the latest build 6.4 it can Load you GM8 GMK then you must click save as then save as GM8/7 gmk with 700 selected I Know it works
Because I Opened the gmk I saved as with since it was a gm8 file at first with the LateralGM That could not load gm8 files(tested that it wont load gm8 as well) and it loaded it 100% fully no errors what so ever