Downgrading from windows 10 to 8.1

[مرتضی عقیقی]

Hello I had a windows 8.1 and then upgraded it to 10 and was using it for 2 years.

Now I decided to remove 10 and use 8.1 again but my original serial key does not work anymore.

How can I activate 8.1 again I do not want to use 10 at all.

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