EOS-ERR-1603 error

If you are receiving this error message it may prompted you to install Microsoft .NET Framework 3.5. In order to resolve this error do the following:

  1. When you receive the pop-up to install the .NET Framework 3.5, click on Download and install this feature.

  2. Once this is installed, click on Close.

  3. You will see the error appear again. Just close the error and start the install process for Epic Online Services. It should complete successfully.

If this doesn't work, please try the steps below;

  1. Make sure there is an Epic Online Services folder in your Epic Games folder (C:\Program Files (x86)\Epic Games)

    • If you don't see this folder, create a new folder named Epic Online Services.

    • Proceed to the next step.

  2. Run Epic Games Launcher as an administrator

    • Right-click on Epic Games Launcher and select Run as administrator

    • If UAC shows up, click Yes

    • Try installing the required component again.

    • If this doesn't work, move on to the next step

  3. Grant write and read access to Epic Games Launcher

    • Type Epic Games in Windows search

    • Right-click and select Open file location

    • Right-click on Epic Games Launcher and select Properties

    • Go to the Security tab

    • Select your username from the list

    • Click on Edit

    • Select your username and make sure the permissions for Read and Write are set to Allow 

    • Click Apply and OK 

    • If this doesn't work, move on to the next step

  4. Shut down Windows Installer service

    • Press Ctrl + Shift + Esc on your keyboard to open the Task Manager

    • Go to the Details tab

    • Scroll down until you find msiexec.exe

    • Highlight msiexec.exe and select End Task

    • If this doesn't work, move on to the next step

  5. Run Install and Uninstall troubleshooter from Microsoft

    • Visit the official Microsoft Website (Opens in a new tab) for the troubleshooter

    • Click Download troubleshooter

    • Once downloaded, double-click the MicrosoftProgram_Install_and_Uninstall.meta.diagcap file

    • When launched, pick the Installing option

    • If this doesn't work, move on to the next step

  6. Run all Windows updates

    • Type Updates in Windows search and press Enter

    • In the new window, click Check for updates

    • Install everything available

    • Reboot your system

    • If this doesn't work, move on to the next step

  7. Manually create Epic Online Services folder and reinstall Epic Online Services

    • Press Win + E to open File Explorer

    • Create the following folder/path: C:\Program Files (x86)\Epic Games\Epic Online Services

    • Go to the following location: [your install location]Epic GamesLauncherPortalExtrasEOS 

    • Double-click EpicOnlineServicesInstaller.exe and install it into the previously created location

  8. Try opening port 80 in your firewall and router

    • Click Start.

    • Type Control Panel and press Enter.

    • Click System and Security.

    • Click Windows Defender Firewall.

    • Select Advanced settings, and then select Inbound Rules in the left pane.

    • Right-click Inbound Rules, and then select New Rule.

    • Select Port, and then click Next.

    • Select TCP as the protocol to apply the rule.

    • Select Specific Local Ports, add port 80, and then click Next.

    • Select Allow the connection.

    • Leave Domain, Private, and Public checked to apply the rule to all types of networks.

    • Name the rule something meaningful (i.e. Epic Games Launcher), and then click Finish.

      The above steps are for Windows 10 and may vary on other versions.

    • If this doesn't work, move on to the next step

  9. If the troubleshooting steps above do not solve this issue, please reach out to Microsoft Support (Opens in a new tab). The error codes are related to the MSI installer that is used when Epic Online Services is installed. As the MSI installer is a Microsoft product, only Microsoft has access to information needed to fix the issue.