Product key not working on win 10

[IsakLaestadius]

I just bulit a almost entierly new system, only keeping the gpu and the memory. Before swapping everything i got my product key from belarc, but as it turns out i cannot activate windows 10 home with that key. The thing is that i originally had windows 7 on my last system but at the time when i got the key i had installed windows 10. So do i need to download windows 7 for the key to work or is there nothing i can do?

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