Datalink question
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There’s nothing to stop you backing up your current U1 install folder (i.e. use Copy > Paste to get a Falcon BMS 4.33 U1 - Copy folder) and then upgrading the original Falcon BMS 4.33 U1 folder with Update 2 to get going with multiplayer again.
None of the config options get changed, so you could have both folders on your drive and just rename each folder when you want to fly that version. There’s no messing about with registry edits or other forms of Falcon voodoo. The folder called Falcon BMS 4.33 U1 will be the one you’re flying, as that’s what the registry will point to.
You can even copy your Logbook between versions to reflect your offline/online achievements.