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How to enable 64 bit testing mode in macOS Mojave 10.14


One can use 64-bit testing mode in macOS 10.14 to test software for 64-bit compatibility.



To enable the 64-bit testing mode:
  1. Boot to Recovery OS by restarting your machine and holding down the Command and R keys at startup.
  2. Launch Terminal
  3. Execute the following command: nvram boot-args="-no32exec"
  4. Restart the machine     

Note: The 64-bit testing mode prevents 32-bit processes from launching. Launching an app that depends on 32-bit software results in a notification that the application can't be opened. 



To disable the 64-bit testing mode:
  1. Boot to Recovery OS by restarting your machine and holding down the Command and R keys at startup.
  2. Launch Terminal
  3. Execute the following command: nvram boot-args=""
  4. Restart the machine 

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