Editor is pink in multiple versions, Graphics API's, and Projects

Friend’s Unity editor is all pink when launching. The only thing that’s visible is the Scene View’s World Axis handles.

I can attach a screenshot when he gets back from his misery meal.

Computer Specs

Windows 10,
i7-8750,
16gb RAM,
Nvidia GTX 1060maxQ


Attempted Workarounds

  • multiple Unity versions: 2019 LTS and
    2018 LTS
  • multiple Graphics API’s : Vulkan,
    OpenGL, DX11,DX12
  • multiple projects: new and previously
    working ones
  • ensuring that his Nvidia GPU is
    being used and NOT his Intel HD
    4000 Graphics

Editor Error Log

Compiling Vertex program
Platform defines: UNITY_ENABLE_REFLECTION_BUFFERS UNITY_USE_DITHER_MASK_FOR_ALPHABLENDED_SHADOWS UNITY_PBS_USE_BRDF1 UNITY_SPECCUBE_BOX_PROJECTION UNITY_SPECCUBE_BLENDING UNITY_ENABLE_DETAIL_NORMALMAP SHADER_API_DESKTOP UNITY_COLORSPACE_GAMMA UNITY_LIGHT_PROBE_PROXY_VOLUME UNITY_LIGHTMAP_FULL_HDR
Shader error in 'Hidden/Internal-GUIRoundedRectWithColorPerBorder': failed to open source file: 'HLSLSupport.cginc' at line 224 (on d3d11)

Please help. We are in agony.

He installed it on his SSD instead of his HDD and it worked.