Lost key, can't downgrade Windows 10 Pro to Home

[Sebastian Cielcki]

Hi,My pc died after power switch during updating the system.I managed to reinstall system, but by mistake I installed Win ProI don't have key for that, so watermark is still on my screen, sadly I lost it with super old pc box.When I'm getting to activation of my key there's poup that says that "System found key of windwos Home not Pro, change system and it will all work" Sadly, when trying to downgrade system it asks me for the key.I was trying different methotds through PowerShell or any other outside apps to find my key in BIOS but there's nothing.I'm not able to find person who sold me PC i

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