My wife's computer is an old Dell (Win10, MBR system) with a second generation Intel CPU and no TPM. Trying to upgrade to Win11 resulted in an error about these incompatibilities... CPU, TPM, Secure Boot. I didn't want to use the registry hacks in case Microsoft inactives them later. An image was created of the Win10 partition and restored to a Win11 compatible computer. Drivers were removed, NVMe drivers were installed and boot files were created. This was done in IFL. A Boot Item was created in BootIt for UEFI and the Win10 OS booted. Windows Update was performed and the OS was upgraded to Win11 from an ISO. All OK. A backup image of the Win11 partition was created and was restored to HD1 in my wife's computer. Win10 is on HD0. After the IFL restore, drivers were removed. On rebooting into BootIt BM, a Win11 Boot Item was created. Win11 booted and Windows Update is working. Win11 is sluggish because it's on a HD. Win10 is on a SSD. If Windows Update continues to work I'll move Win11 onto a SSD.