hi @FreshBeezy ,
If you have tried starting UEFN using the article
[Solved] How to fix Fatal Errors in UEFN related to Graphic Cards and Shaders and Derived Data problems
The answer to the operating system problem is to buy the cheapest Windows 10 Home Edition copy and install it on your PC.
For my testing, the only reason for using Windows 11 is to find workarounds to allow people to use Windows 11 for developers who cannot go back to Windows 10.
Keep in mind that all your projects must be backed up to Unreal Revision Control and NOT ON OneDrive of Windows 11.
URC (Unreal Revision Control) Sync function requires a reliable fast connection (NOT Oceana) at a quiet time.
If you cannot understand URC then DONT reinstall Windows
There have been so many problems attributed to OneDrive that a message now appears on opening a project to warn of using Cloud Base storage because if networks stop working you lose your project!.