Ableton Forum

Ok, so I installed version 10 and have been using for a while. Everything works. All projects have been moved. I'm ready to free up some space and remove version 9.
What can I delete without messing up Live 10. The new version is digging into various previously installed packs and stuff. Don't wanna mess anything up.
B.

You can remove the Live 9 application without any risk.
You can also remove L9 related preferences files.
There's Help articles if you need more details.
Of course you don't want to delete anything regarding your user library and Packs.

If you're just after freeing up space, then thrashing the L9 application is just fine. The few preferences files virtually don't use any space so you should not bother about them.

In any case, if you need L9 for any reason at some point you can simply re-install it.