Steam Unreal Engine 5 game not working

[LaurentR2D2]

Hello

I have a Mac Studio M1 Max 32 Gb with Mac OS Tahoe. I'm testing a game done with Unity 5 (a reboot of Tex Murphy Under a killing moon). I've installed it using Crossover and Parallels Desktop with Windows 11. On both I have a warning about my Mac not having enough graphic memory. With Crossover, I can run the game, even if sound is jerky. I can move my character and use the game controls. With Parallels Desktop, I can see the videos displaying the narrator introducing the game, but when it comes to the game itself, I get a white flickering screen. Normally games run better with Parallels Desktop, so I wonder what can cause this problem. Could it be a driver problem or a Unity 5 problem ?

Thank you

 

[LaurentR2D2]

I've found this on Google :

Intel Macs: Parallels runs Windows via hardware virtualization, meaning Unity 5 and its exported games generally run well with direct access to x86 graphics instructions.Apple Silicon (M1–M4): Parallels runs Windows 11 ARM. Unity 5 is a legacy engine (released around 2015) that relies on x86/x64 architecture and older DirectX implementations. It will run through Windows ARM's built-in translation layer, which can cause graphical glitches, terrain rendering issues, or performance slowdowns. [1]

(

https://www.reddit.com/r/gamedev/comments/16k1qz4/game_developing_on_macbook_pro_silicon_with

), [2] (https://forum.parallels.com/threads...cs-on-parallels-26-3-0-windows-11-arm.369758/), [3] (

https://www.reddit.com/r/macgaming/comments/1rjmqxo/unity_game_terrain_broken_in_parallels_on_apple

)

Known Limitations and IssuesGraphics & DirectX: Unity 5 relies heavily on DirectX 9, 11, or OpenGL. Parallels provides virtualized GPU support for newer DirectX APIs, but legacy shaders or specific rendering pipelines in Unity 5 may fail or display artifacts.Recent Update Conflicts: Certain Windows 11 ARM updates have been known to cause Unity-based applications to freeze on loading screens within virtual environments. [1] (https://forum.parallels.com/threads...cs-on-parallels-26-3-0-windows-11-arm.369758/)

Is this the cause of my problem ? Is there a way to fix that ? The March 2026 thread quoted above suggested to uninstall some Windows update. Is this the solution? Last update I've applied seemed to be mandatory to keep Windows working (If I remember well )

I've tried to put this in the boot commands of Windows VM :
video.untrimmed_dynamic_cbuffers=1

Then this in the game option :
-force-d3d11
-force-glcore

Both try didn't work

 

[LaurentR2D2]

Hello,
I'm sorry but I've made a mistake confusing Unity 5 and Unreal Engine 5. It's the last one which used for the game I'm testing. I'm a noob for all these things. I've searched on Google, and have found that Unreal Engine 5 uses DirectX 12 which is not yet supported by Parallels.

Why UE5 Fails on Parallels

Why UE5 Fails on Parallels
Graphics API Limits: Unreal Engine 5 requires advanced feature levels (like DirectX 12 or Vulkan) that the Parallels Desktop virtual graphics driver cannot fully or stably emulate on Apple Silicon.

Frequent Crashes: Users attempting to run the full UE5 editor in a Windows 11 ARM virtual machine usually experience immediate black screens, driver errors, or crashes on startup

If this is the case, I'll stay on other emulators like Crossover or Whisky