The specific situation is as follows:
I downloaded a system based on WIN10 Professional Edition and found that almost all U engine-based games cannot be played. Fallen King and RoboCop are examples.
According to the requirements, I found that my WIN10 cannot install updated firmware. Yes, there is a basic problem with this system. So it's not suitable for gaming at its roots.
As for Lord of the Fallen, it was because of a conflict between my 3090TIAMD GPU and my 13th generation IN CPU that I had to use various methods to correct the damn evil of U5 and "Tencent's EPIC". For details, please refer to the related "Fatal Error Issue" discussion on STEAM.
Today, my friend's laptop also couldn't run this game. I found out that it might be related to the graphics card driver. His driver was a mini version and was forced to run under DX12, which caused a conflict with this game. I had to install and adjust it. Only DX and graphics card drivers can enter the game normally.
Sounds like you did mess something up with your system by trying to correct U5 (which I assume you mean Unity) and EPIC. I have a 4060ti and Ryzen 5600x and never have any issues, even if I use a GPU driver that is a couple versions behind. I'm also not sure which "Fatal Error Issue" discussion you're referring to, as there's over 12k pages of search results in Steam discussions.
Also sounds like whatever system you downloaded that you say is based on Windows 10 Professional Edition not being suitable for gaming at its roots, maybe not the best idea to use if you plan to play games. It's possible to get it to be able to play games, but it will require a lot of work and installing a lot of things.
As for your friend's laptop forcing DX12, it is possible there were no files for DX11 installed on the laptop, and installing that can be done (safely) only by going to
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and following instructions there. I'm also not sure what you mean by the driver being a mini version, unless you mean it's the bare necessities needed for the GPU to work, in which case it would cause errors.
Overall, sounds like most of the issues come from user error in installing non-ideal or non-optimal operating systems for playing games that use DirectX, and installing modified graphics drivers instead of official drivers that have all the features needed.