You most likely have the wrong architecture ISO file. What is the name of the ISO file that you are using to install and where did you get it from?
If you built the ISO using the instructions in the guide (which requires the download of a script and a couple of open source utility packages), you'll get a ISO that is named something like "22621.525.220925-0207.ni_release_svc_refresh_CLIENTCONSUMER_RET_A64FRE_en-us.iso" (where the en-us will be replaced by the language that you selected for build). That's a Windows 11 for ARM ISO and this will not cause the message to appear.
If you downloaded the ISO directly from Microsoft, that's going to be named something like "Win11_22H2_English_x64v1.iso" - thats's Windows 11 for Intel CPUs. Dragging and dropping that ISO onto the Fusion "Create a new virtual machine" dialog will create a VM for Windows 11 x64. Trying to boot that will give you the message you posted.
If you open the settings of the the VM you are creating, click on the "General" icon. The VM's general settings should be opened. What is the OS set to (it's right underneath the VM's name in the general settings dialog"
- Paul (Technogeezer)
Editor of the Unofficial Fusion Companion Guides
