How to fix EOS ERR 1603 Epic Games failed to install?

Question

Problem: How to fix EOS ERR 1603 Epic Games failed to install?

Hi there. Every time I try to install Epic Games Online Services, I get the EOS ERR 1603 error. It asks me to install NET Framework 3.5, even though I have it already installed. Any idea what this could be?

Resolved answer

Epic Games Online Services is a type of service provided by the company that enables game developers to run and manage their games successfully. Developers can access these services among other platforms, stores, game engines, making it a very convenient tool.

In other words, it is a part of the Software Development Kit (SDK) that makes it easier for developers to create, manage, scale, or operate their game creations. These services were introduced in May 2020, alongside the announcement of Epic Unreal Engine 5.

Although many developers were happy about this iteration (it can be installed through the Epic Games Launcher), others were not very lucky when it came to installing Online Services. These errors are normally marked as “EOS ERR” codes and may include a number pointing to the reason for the problem.

Epic Games EOS ERR 1603 is an error that occurs when trying to install new functionality, an update, or Online Services itself. As a result, game developers are unable to use the services feature. Here is the full message:

Install failed

Epic online services has failed to install.
Error Code: EOS-ERR-1603

The reason this error occurs is based on Microsoft .NET Framework 3.5 – software development relies heavily on this component. In most cases, it installs alongside Windows updates and should work without a hitch.

However, some programs can interfere with this component and replace particular files with third-party ones. This is one of the main reasons why DLL errors occur (for example, MSVCR71.dll, VCRUNTIME140.dll, or MSVCP100.dll). If there is a missing DLL that is causing this problem, we strongly recommend that you try a PC repair tool like ReimageMac Washing Machine X9 to solve this problem for you.

The error suggests downloading and installing Microsoft .NET Framework 3.5. However, most of the people have stated that they already have the component installed or that the installation was unsuccessful. Below are several methods that should help you fix the error code EOS-ERR-1603 correctly.

Solution 1. Run Epic Games Launcher as administrator

Right click on Epic Games Launcher and select Run as managedr
If the User Account Control appears, click on Yes
Try to install the required component again.

Solution 2. Run all Windows updates

Microsoft .NET Framework 3.5 is part of Windows Updates, so apply all available updates to make sure you have the component installed.

Writes Upgrades in Windows search and press Enter
In the new window, click on Check for updates
Install whatever is available (including the Optional updates)
Reboot your system.

Solution 3. Ensure read and write access to Epic Games Launcher

Writes Epic games in Windows search
Right click and select Open file location
Right click on Epic Games Launcher and select Properties
Go to the tab Security
Select your username from the list
Click on Edit
Select your username and make sure the permissions of Reading and writing are configured to Let
Click on Apply and To accept.

Solution 4. Shut down the Windows Installer service

Press Ctrl + Shift + Esc on your keyboard and open the Task Manager
Go to the tab Details
Swipe until you find msiexec.exe
Select msiexec.exe and select Finish homework.

Solution 5. Run the Install and Uninstall troubleshooter from Microsoft

Visit the Microsoft official website from the problem solver
Click on Download troubleshooter
Once downloaded, double click on the file MicrosoftProgram_Install_and_Uninstall.meta.diagcap
When it runs, choose the option to Install

Solution 6. Reinstall Epic Games Launcher on your main disk

If Epic Games Launcher has not been installed on the same disk as Windows, you should try installing it on your main disk. Many users said that they managed to fix the EOS ERR 1603 error after reinstalling Epic Games Launcher on their main disk (by default, C:).

Alternatively, you can manually run Epic Games Online Services and install it in the correct path as explained below:

Press the keys Windows + E to open the File Browser
Create the following folder:
#advanceampads1#
Go to the following location:

[your install location]\ Epic Games \ Launcher \ Portal \ Extras \ EOS
Double click on EpicOnlineServics.msi and install it in the previously created location.

Fix your Errors automatically

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Reimage – a specialized proprietary Windows repair program. It will diagnose your damaged PC. It will check for all System Files, DLLs and Registry Keys that have been damaged by security threats.Reimage – a specialized proprietary Mac OS X repair program. This will diagnose your damaged PC. It will check all the System Files and Registry Keys that have been damaged by security threats.
This proprietary repair process uses a database of 25 million components that can replace any damaged or lost files on the user’s computer.
To repair the damaged system, you have to purchase the licensed version of the Reimage malware removal tool.

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