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How to fix Unity Simulator error "Error allocating PAT memory space"

There is a hotfix, # HF0435420R  for UnityPro S, L and XL versions 11.1, 12.0 and 13.0.

For versions prior to 11.1, the following may correct the error.
  • Go to windows flag and type “adjust the appearance and performance of Windows.   Under Performance Options, disable ‘use visual styles on windows and buttons’
Until this problem is corrected, you can replace the simulator executable with the Unity pro v11.0 simulator. Sim.exe
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