Thank you for the informations.
After installation your Windows will probably recognize the activation automatically.
Anyway, you can execute the command below to know your windows key.
Product key via Command Prompt.
Click the Windows key + X.
Select Command Prompt (Admin) ou Windows PowerShell (Admin).
Enter the command below to find your product key. Don't forget to press Enter
wmic path softwareLicensingService get OA3xOriginalProductKey
The key will appear on the screen, so you can write it down to save.
I await news.
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