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Here you can find windows 10 and 11 downloaders :

How to activate Windows 11 license

Buy Windows 11 Pro

Buy Windows 11 Home

Windows 11
Windows 11 pro

To activate Windows, you need a product key. A product key is a 25-character code, that looks like this: PRODUCT KEY: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

During installation, you’ll be prompted to enter a product key.  Or, after installation, to enter the product key, select the Start button, and then select SettingsUpdate & SecurityActivation Update product keyChange product key.

1- Click on the start button, then go to settings

2 – Click on Windows 11 isn’t activated. Activate windows now link. If you don’t have it, select update & security  then Activation

OR

3 – Click on Update product key

4 – Enter the product key we have sent you and click on next.

5 – Click on Activate

Congratulations! your windows is now activated.