Last stable build of serialosc for Max 6?

Hey y’all… I’m trying to get into building my own apps for the monome but I’m unwilling to switch to/buy Max 7. Of course I’ve got a copy of 7 but I can’t save anything I do so it’s left me unable to really get into patching for this thing.

So basically, I’m wondering what is the last best version of serialosc I could be using to develop in Max 6?