Installing fresh Windows 11 Pro on the HP EliteDesk 800 G1/G2/G3 Mini doesn't seem to be an issue upgrading from Windows 10 does. In this video we show how you can upgrade those systems and keep your existing apps and data.

TPM Firmware Updater: https://support.hp.com/auen/document...
Microsoft page with info on modifying the registry and upgrading machines that don't meet the minimum requirements: https://support.microsoft.com/enus/w...