Product key not working?

  • Hi,


    So recently bought a new pc it did not have windows on it so i installed windows 10 on a flash drive installed windows and skipped the part where i had to i was using a legit product key from Windows 7 i still had laying around but it did not work so far i was wondering how can i activate windows without downgrading to 7 to activate and then upgrading again ...?


    Please help.


    I did not find the right solution from the Internet.


    References: -
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    Thanks!