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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’
  • Turn off Windows Firewall
  • Kill dwm.exe (desktop windows manager) from the Processes.  You may have to do this twice. 
 
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