the documentation tells it. So stable should install 2.5
But be aware that you might have troubles installing bindings due to the sunset of bintray:
Anyhow before spending the time (i know you explicitely mentioned you want to stick with oh2) fiddling everything so that oh2.5 runs as before, think about if it wouldn’t be worth the time to jump to OH3 directly if you install your system from scratch anyhow.
