Not even a week ago, Microsoft doubled down on its policy that requires PCs to have TPM 2.0-compatible hardware in order to install Windows 11. But now, in an unexpected and puzzling move, the company is issuing instructions for installing Windows 11 on incompatible PCs.

You can find those official instructions on this support page. However, Microsoft begins the instructions with a direct warning:
https://support.microsoft.com/en-us/windows/installing-windows-11-on-devices-that-don-t-meet-minimum-system-requirements-0b2dc4a2-5933-4ad4-9c09-ef0a331518f1. //

For anyone who updates to Windows 11 despite not meeting the requirements, Microsoft offers the opportunity to return to Windows 10. However, this is only possible for 10 days after upgrading.

The option to revert can be found in Settings under System > Recovery > Recovery options. The step-by-step process will then take you back to Windows 10. However, you should create a backup before upgrading to be on the safe side in case something goes wrong.