Old HDD drive died, we replaced it with an SSD and installed Windows but the old key won't work on the new Windows installation.

[Windows Server]

My friend's hard drive died but we were able to recover the product key from Windows. He was running Win 8.1 before the drive died.This key should be good for Windows 10 or 11 shouldn't it? I tried running the key though the "ShowKeyPlus" app but it says: Edition -> Invalid Key EULA -> Not Applicable.This key was taken from a working Win 8.1 PC and we just want to install the new SSD and install an OS to get it running again.We've got Windows 11 Pro running on the machine with the new drive but can't activate Windows with the old key. We weren't sure if it was 8.1 Pro or Home etc. bec

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