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sabretache - MS will probably ask questions like these
Did you take a system image of your Win 8.1 system before you upgraded to Win 10 ?
Did you take a system image of the Win 10 system before you backtracked to Win 8.1 ?
Do you have all your data backed up ?
Do you have installable media for 8.1 should you need to rebuild from barebones ?
To be forewarned is to be forarmed
BR