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Once you have upgraded to W10 Home you can upgrade from Home to Pro just by changing the installed key to a valid Windows 10/11 Pro key. See Step 4 here:
Upgrade Windows 10 Home to Windows 10 Pro
Once you have upgraded to W10 Home you can upgrade from Home to Pro just by changing the installed key to a valid Windows 10/11 Pro key. See Step 4 here:
Upgrade Windows 10 Home to Windows 10 Pro
The procedure I've described above is called "In place upgrade" and should keep data and programs.
As S... can happen, is always recommended to make a drive image and save on an external drive so you can recover in case something bad happens.
Couple of ways to do it.
Upgrade win7 Home to pro first ( it is quick and easy ) any win7 pro key entered into anytime upgrade does the job of upgrading the edition.
If you want to activate after upgrading the edition, need a valid win7 pro key.
Or upgrade the win10 Home to pro afterwards.
The "sources thing" only affects clean installs. It will have no effect on the upgrade from Windows 7 that you want to do. The correct method is what the others have posted: do the upgrade to Windows 10/11 Home, and the upgrade the Windows 10/11 Home to Pro by changing the product key to a valid Windows 10/11 Pro product key.