5 Ways to Fix the Epic Games Eos-err-1603 Error on a Windows PC

Many players report the Eos-err-1603 error occurs when they try to install Epic Online Services. For example, a player’s Reddit post says, “The (Epic) store itself installs without a problem, but when I try to install the Epic online services it fails with error message EOS-ERR-1603.” Consequently, players can’t install Epic Online Services, which is required to play certain games that rely on its cross-play and online connectivity features. This is how you can fix the Epic Games Eos-err-1603 error on Windows PCs.

Set up a New Epic Online Services Folder

Players have confirmed setting up a new Epic Online Services has fixed the Eos-err-1603 error for them. This highlights that missing Epic Online Services can cause this gaming issue to arise. You can set up a new Epic Online Service folder like this:

1. Open File Explorer and bring up the Program Files (x86) > Epic Games folder path.
2. If there isn’t an Epic Online Services subfolder in that directory, right-click inside the folder to select New > Folder.
3. Input Epic Online Services for the folder’s name and press Enter.

   

4. Click the Start menu and the Power > Restart options.

Run the EpicOnlineServiceInstaller for Fall Guys

Another resolution that has fixed the Eos-err-1603 error for many users is to run the EpicOnlineServiceInstaller for Fall Guys. To do this, you must install the Fall Guys game first and then run its EpicOnlineServiceInstaller. This is how you can run the EpicOnlineServiceInstaller for that game.

1. Bring up the Epic Games Launcher window.
2. Click in the Epic search box and input Fall Guys to select that game.
3. Press the Get button for Fall Guys.
4. Next, go into the Epic’s Library tab; and click the three-dot button for Fall Guys.
5. Click the Manage > Open Install Location options.
6. Double-click the EpicOnlineServices in the FallGuys folder.

The EpicOnlineServiceInstaller file

Run the Program Install and Uninstall Troubleshooter

Running the Program Install and Uninstall troubleshooter might also resolve the Eos-err-1603 error for some users. That is a troubleshooter that can address software installation issues. These are the steps for running that troubleshooter:

1. Open this Microsoft page.
2. Click the Download troubleshooter button.
   
   

   The Download troubleshooter option

3. Next, double-click the MicrosoftProgram_Install_and_Uninstall.meta.diagcab file downloaded.
   
   

   The Program Install and Uninstall troubleshooter

4. Click Next in the troubleshooter to go through its steps.

Enable .NET Framework 3.5

The official Epic fix for the Eos-err-1603 error is to enable the .NET Framework 3.5. Framework 3.5. is a feature that needs to be enabled to install Epic Online Services. You can enable .NET Framework 3.5 like this:

1. Start Run using the Windows logo + R hotkey for that accessory.
2. Input the appwiz.cpl Run command and press Enter.
3. Next, click Turn Windows features on or off.
4. Select the .NET Framework 3.5 checkbox.
5. Click OK to proceed with the installation of .NET Framework 3.5.
6. Select the Download and Install this feature option.
   
   

   The Windows Features options

7. Restart Windows after installing .NET Framework 3.5.

Reinstall Epic Games Launcher

If nothing else works, try reinstalling Epic Games Launcher. Applying this potential fix will also uninstall games installed with the Epic client. This is how you can reinstall Epic Games Launcher:

1. Go through steps one and two of the previous resolution to access Programs and Features in the Control Panel.
2. Next, select Epic Games Launcher and click Uninstall.
3. In addition, select Epic Online Services and click Uninstall.
   
   

   The Uninstall option

4. Bring up the Microsoft Store via the Windows Start menu.
5. Enter Epic Games Launcher in the MS Store search box.
6. Click Epic Games Launcher in the search results.
7. Press Install for the Epic Games Launcher app.

The potential resolutions discussed above will usually resolve the Eos-err-1603 error. With that potential gaming issue fixed, you can install Epic Online Services and play all games that need its features. If you need more potential solutions for this error, click Contact Us on this Epic help page.