Microsoft have been seriously failing on the Windows Update front for decades.
It's unsupported but works just fine. The trick on how to do it is embarrassingly simple. Just download both the Windows 10 and Windows 11 ISOs, replace the "install.wim" in the Windows 10 ISO with the one from the Windows 11 ISO (it's conveniently the same file name) and run the setup.
The upgrade works just fine since the Windows 10 installer doesn't check for supported hardware, TPM or secure boot.
Really goes to show how all that TPM, secure boot and CPU support business is just a marketing ploy to increase hardware sales...
I assume you meant Windows 10 to Windows 11? Because that's exactly what I described. The setup on the Windows 10 ISO (once you replaced the "install.wim" with the Window 11 file) will perform an in-place upgrade. All programs, data and settings are preserved.
1 - https://docs.microsoft.com/en-us/windows/whats-new/whats-new...
2 - https://docs.microsoft.com/en-us/windows/whats-new/whats-new...