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Steam Demo · 2 task guides
Startup & graphics
Choose by the actual failure, not the brand of your GPU. An instruction-set error, a black menu and a crash after a long session are different observations. None of the community reports proves one universal fix.
What are you trying to do?
The error explicitly says SSE4.2 is requiredCheck the CPU feature exposed to Windows. Graphics flags cannot add a missing instruction.Open the guide →I get a black screen or a graphics-driver crashRecord the failure stage and hardware, then try the isolated, reversible renderer test if applicable.Open the guide →
A useful order to check
- For a black screen, compare your GPU with the dedicated-graphics and Vulkan requirements before changing settings.
- Record whether the failure happens before the menu or after playing. Save your original launch options.
- Match the symptom to the guide below. Test one change, record the result, and restore the original options if it does not help. Do not delete saves to diagnose a hardware error.
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What are you working on?
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- Diagnose the SSE4.2 CPU error at Demo startupCheck whether Windows exposes SSE4.2 to the Demo and distinguish a CPU instruction requirement from graphics, language or save problems.
- Try a reversible OpenGL launch test for graphics crashesApply the community-proposed Godot compatibility flags in Steam, test the result and restore your original launch options if they do not help.