Hmm, so you're saying that in fact all games are still running on 2.12 until the owners decide to restart? I suppose that should have been obvious, but I didn't really think about it.

In that case I take it back. You just announce that you've installed the upgrade, and every game can decide when they want to change Versions (though I guess circumstances might force their hands)

I guess we'll all be a bit clearer on how it works next time it happens.

Mark