@gene05 

You have a pre-installed Windows 11? No QB Desktop version runs on Win 11 natively at this time. You should be able to clean install Windows 10 with the Windows 11 OEM license key that the PC comes with - so should not have to buy another license or disc as you can make your own Windows 10 Install USB/CD using Windows 10 MCT or other sources. Once QB Desktop supports Win 11, you may upgrade it later. You can still buy the one time license for QBD 2021 from several partners if required.