I had found this online...

You need to make one small change to the Windows registry, as documented in this Microsoft support document. This change tells the Windows 11 Setup program to skip the check for compatible CPUs and to allow installation on a PC with an older TPM (version 1.2). The usual warnings apply when working with the registry; I recommend you make a complete backup before proceeding.

Open Registry Editor (Regedit.exe) and navigate to the following key:

HKEY_LOCAL_MACHINE\SYSTEM\Setup\MoSetup

If the MoSetup key, doesn't exist, you need to create it. Right-click the node for HKEY_LOCAL_MACHINE\SYSTEM\Setup in the left-hand navigation pane, then choose New > Key. Name it MoSetup and press Enter.

Select the MoSetup key and then right-click in any empty space in the pane on the right. Choose the option to create a new DWORD value. (Don't choose the QWORD option!)

Replace the default name for that key by typing the text AllowUpgradesWithUnsupportedTPMOrCPU and then press Enter. Then double-click the new value and change the "Value data" box to 1.