win8 side by side with win 10

[re66]

I have installed a win 10 on my win8.1 computer on differant partition.

After few days win 8.1 say that my activation key is wrong and I need to reactivate.

I'm affraid that reactivation will only after my next win 10 upgrade ( probably reseting key in the bios )

What can I do ?

 

[davidhk129]

I have installed a win 10 on my win8.1 computer on differant partition.

I am assuming that you meant to say your Windows 10 is not activated, not your Win 8.1.
If I am wrong on that assumption, please correct me.

You cannot install Windows 10 on a partition which does not have an existing genuine qualified Windows operating system in it. That is why your Windows 10 is not activated.

In order to upgrade to Windows 10 and be activated, you are required to install Windows 10 over your Win 8.1.
A clean install will not activate Windows 10.
Windows 10 product key is needed for activation and nobody has it. That is why you must do upgrade install instead of clean install.
Win 8.1 product key will not work to activate Windows 10.