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Apr 18, 2013

Can't Install Flash on OS X Mountain Lion Error: General installation error

Problem: Can't install latest version of Flash on OS X 10.8 Mountain Lion. Installer starts fine, but fails at 50% after downloading the required software.


  1. Download Flash installer.
  2. Mount disk image.
  3. Run Flash installer.
  4. Enter password to allow installation.
  5. Installer downloads installation files.
  6. At 50% progress, installation begins.
  7. Installer stops at this point with Error: General installation error

Analysis: The installation starts a second process or app. When that app attempts to launch the proper rights have not been passed to it (some sort of bug). Thus, the installer can't write to the disk and fails. I am not 100% sure that is the problem, just my guess.

Solution: You have to run as superuser and launch the app from the command line to get it to work. If you are uncomfortable doing this find a techie friend to help you.

In a nutshell, after starting the installer (mounting the disk image) you need to launch

./"Install Adobe Flash Player"


/Volumes/Adobe Flash Player Installer/Install Adobe Flash


  1. Make sure the Flash disk image is mounted on your desktop. If it isn't, double click on the .dmg file you downloaded from Adobe.
  2. Open the Terminal app from Applications -> Utilities
  3. Type sudo bash
  4. Enter your password. You are now superuser
  5. cd "/Volumes/Adobe Flash Player Installer/Install Adobe Flash"
  6. Enter pwd and make sure you are in the correct directory. You should see: /Volumes/Adobe Flash Player Installer/Install Adobe Flash
  7. To launch the installer type: ./"Install Adobe Flash Player"

As you can see, not for the feint of heart. Good luck!

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