See
if you want to go back to older 2.X versions.
But you did upgrade from 1.X ?? Possibly you could do it with the method above (just the package name is different) but it was not designed to work that way, so safer and easier is probably to restore your old server from backup.
Going 1.X to 2.X of course requires to rework your config, you should have read about that in the docs and forum.
There’s even a migration tutorial you should look at.