I installed XP onto a VM for regression testing only to find that I couldn’t get the licensing to clear. Apparently the KMS license is saturated. I argued with a drone @ MS that we had retired thousands of XP boxes so there should be plenty of “water in the pool”. MS said no and I would have to purchase additional licenses - for an OS that was essentially dead.
I only need the VM for a two weeks and the license timer runs for 30 days. Guess which way I went ;’)
slmgr -rearm
That will give you another 30 day grace period.
You can run it 4 times, too.