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# 1.5.2 OSX Installation Mac Installation

XTrackCAD for OSX is shipped as a package containing an application.

1. Start the installation by opening the package and dragging the contained application into the Applications folder using the shortcut in the package. The application includes the program, documentation, parameter and example files within it.

2. To run on Apple MacOS, the XQuartz package must first have been installed - see http://www.xquartz.org. XQuartz will need to be upgraded after each OS version upgrade.

3. OSX Run Security When the application is first run, it will need to be authorized by OSX. There will be a OSX prompt that asks if it should be opened. And then it will still fail to run. After opening it for the first time, go to System Preferences>Security & Privacy and you will see that the app is named as having been blocked. Hit the Run Anyway button and the program should start. This sequence may be necessary after each OS upgrade.
4. On Mac OS Catalina, the program will need to be started by right-clicking it and selecting Open.