v5 isn't "unstable," it just sucks. You're alot better off IMO going with the last v4.2 release if you're going with vBulletin.
Quote:
Currently I am using FusionBB 2.3 over 10 years. I have been told that the product is at" end of life for support."
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This doesn't necessarily mean you have to ditch it. It just means the version is no longer supported, meaning no more security updates or patches. If you're not having problems there's no reason really, to change. It's not going to suddenly stop working.
Panic "upgrades" never go well. If it ain't broke don't fix it.