Yeah it's 2.37
Are you going to combine the 2.4 and 2.37 versions, or are they remaining separate? It's a bit confusing.
2.4 is a superset of 2.37. That is, 2.37 contains no features 2.4 does not have. Well, minus a few things with ties, which are rather confusing to me at the moment. But I'm working on it.
There just aren't alot of new bots specifically for 2.4, and older bots definately work better in 2.37. I think this is primarily a result of bots now getting really tiny.