install win10 on new pc after old one died

[Windows Server]

I have a home built PC I built in 2014. It recently died. It kept throwing CMOS errors and nothing worked to fix it. I have a new PC with, unfortunately, win11 preinstalled. I want to ditch 11 and install 10. I know I can use the media creation tool to build an ISO of 10. The problem is, I have no way to determine to dead units product key. What options do I have?

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