Sure it's possible but only if you download 2.5 outside of Assist. Jonny's files are clean. But stop and think about it for a bit. Why would someone take the time to download 2.5, make a hack, stick it in 2.5 and upload an installer with the hack? The game is over 5 years old and to be honest, there's not many players right now. The fact of the matter is, the hack you got caught for was compiled 1 week ago. It's extremely unlikely someone created a 2.5 installer with the hack built-in.