"from my technical support standpoint we suggest not upgrading to Windows 11 unless your hardware supports it, as there could be many unforeseen issues that could prevent BIAB and other audio apps from working properly."
Then you simply plug the Win10 cloned drive back in same as you would do on Mac when things don't work anymore and companies are taking ages to make the app compatible with this week's new OS.
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ReaTrak Biab & Plugin in Reaper
Free Biab Chord Picker Tool