Diablo® III Installation Troubleshooting


Use the steps below to troubleshoot installation issues for Diablo® III.


  1. You may not have the proper permissions. Create a new administrator account and try again.
  2. If you are using Windows Vista, Windows 7, or Windows 8, run the game in Administrator Mode to address many installation errors.
  3. To resolve any issues with your Battle.net Update Agent (Agent.exe), try these steps:
    1. Bypass your router by plugging your computer's ethernet cable directly into your modem.
    2. Stop the installation process if it’s still running.
    3. Wait for at least one minute. Ensure that Agent.exe no longer appears in the Processes tab of your Task Manager.
    4. Restart the installation.
  4. Try deleting the C:\ProgramData\Battle.net folder, then reattempt the installation.
  5. Some connection issues can be caused by interference from security software. See our Disabling Security Programs guide for assistance.
  6. Programs running in the background can interfere with the game. Close any running background applications.
  7. Check your Diablo III DVD for damage. If your disc is too damaged to work, you can download the game instead.
  8. Ensure that Windows' Secondary Logon is enabled, which Agent requires to run correctly.
Advanced Troubleshooting
  1. The file being read may be corrupt. Run Check disk and defragment your hard drive to try to repair any bad sectors.
  2. Errors in your computer’s physical memory can cause the game to crash. Run the Memory Diagnostic Tool.
  3. Certain malicious software can lock down necessary data that the game needs to run. Run a virus scan.


  1. Run the game in Administrator Mode to address many installation errors.
  2. Ensure your Mac meets the Diablo III System Requirements and has 12 GB of free HD space.
  3. Our games require an up-to-date operating system to run properly. Run Software Update to be sure you're using the most recent version.
  4. Sometimes third party archiving applications can extract files with invalid permissions. Using Apple's Archive Utility will extract the files with proper permissions.
  5. Due to the way the launcher installs and updates our games, security programs can interfere with the process. Disable or temporarily uninstall your security software to resolve this issue.
  6. Programs running in the background can conflict with the Update Agent. Try closing background applications.
Advanced Troubleshooting
  1. The folder may be saved on a corrupt hard drive sector. Run the Repair Disk utility to resolve hard drive issues.
  2. If you're using a wireless connection, switch to a wired connection and optimize your internet connection to rule out a connection issue.
  3. Configure your network to ensure that your connection is not being blocked by a firewall or router.
  4. Run the Apple Hardware Test to ensure that there are no physical problems with your hard drive.

Tried everything here?

If you have tried all of the steps for your operating system and still require assistance, please visit our Technical Support Forum or contact us.

Get Help

Still can't find a solution? Submit a ticket and someone will help out!