I upgraded from windows 8.1 to windows 10 and it didn't activate

[Staś Okurowski]

Hello, today I upgraded my Windows 8.1 to a never one and the key from older version didn't activate on my Windows 10. What do I do? I already tried troubleshooting on System > Update & Security > Activation but it told me they weren't able to activate windows on this device. I don't know what to do. Please help me. (edit) I've also tried typing in my product key (activating) and it showed me this: (look at the picture)

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