L-system - where can it be found?

Hi people! I’m currently in need of a few trees, and the best idea from searching the forums seems to be l-system. I’m not sure what the situation is with l-system at the moment - I only seem to be able to find it for Blender 2.20 and things like that.
Are there any more up-to-date versions, or do I have to download 2.20, then transfer the model?


That should work with 2.37 and py.2.3


OK, so do you need to have Python installed?