Windows 10 activation - Microsoft Community


hi have small doubt.any 1 please me.currently i'm running windows 8.1 , windows 10 in dual boot mode.i want revert laptop original windows 8.1 came pre-installed os while in purchasing time.i have backup of windows 8.1.my doubt after restoring 8.1 cd's.if dual boot laptop again windows 8.1 , windows 10 iso file windows 10 got automatically active or else want buy license. 

if had windows 10 installed , activated on pc during installation process skip steps ask product key , select option 'i reinstalling windows 10 on pc', , activation not issue, pc have digital entitlement stored on microsoft servers

 

otherwise have purchase windows 10 licence



Windows / Windows 10 / Install, upgrade, & activate / PC



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