I bought a key to Windows 7 pro long ago and attached it to my Microsoft account. It upgraded to Windows 10 and then 11 for free. When I want to install Windows

I bought a key to Windows 7 pro long ago and attached it to my Microsoft account. It upgraded to Windows 10 and then 11 for free. When I want to install Windows I just use the official tool to create install media on a USB stick. Then I login with my Microsoft account during the install process. That's it.