How stop update to Windows 11

I have two M1 Macs running Windows ARM Tech preview Dev Channel. They have both updated to Windows 11.

I would like to keep one of them on Windows 10, so have replaced the Windows 11 VM with a Windows 10 backup, but can't see a way of stopping the Windows 11 update happening again.

I have paused updates for seven days to try and find a way.

Thanks for any help.
 
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