Installing Windows 11 on ESXi 6.5
TL;DR: You can’t upgrade. Do a clean install with EFI ( it will do bios by default) and enable secure boot for efi. Boot from the Windows 11 ISO and use the BypassSecureBootCheck and BypassTPMCheck registry settings. Then install as normal. I have a Windows 10 VM on my Xserve 3,1 running ESXi 6.5 that …