Epic Games Launcher

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IS-MF01 when attempting to install a product or update in the Epic Games launcher

Last Updated: Mar 14, 2018 02:35PM EDT
This error code means that the launcher has failed to patch an installation due to a separate running process holding a lock on the files.  In most cases, this is because the game you're trying to patch is currently running.  To correct this issue:
  • Close any instances of the game that you are attempting to patch.
  • Kill any game or launcher-specific processes still running from your task manager.
    • ​Open the task manager by pressing CTRL+Shift+Esc
    • Use the End Process button to kill any of the following processes you find
      • ​EpicGamesLauncher.exe
      • OrionClient-Win64-Shipping.exe (Paragon)
      • FortniteClient-Win64-Shipping.exe
  • Reboot your computer.  If this doesn't solve the issue, move on to the next steps.
  • Try temporarily disabling your antivirus program and any network monitoring software you have installed.
  • Try these steps to disable all background applications and see if another program is causing the issue.
  • Make sure you are running as an Administrator on your computer.
    • Navigate to Start> Control Panel> User Accounts> User Accounts.
    • Select Manage User Accounts.
    • If you are an Administrator, Administrators will be listed beside your username under Group.
  • Make sure you have read/write access to the selected install path.
    • Navigate to your selected install location.
    • Right-click and select Properties.
    • Select the Security tab.
    • Select your username in the Group or user names box.
    • Verify that there is a check under Allow beside both Read and Write in the Permissions box.
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