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Error codeEpic Games StoreWindows PC
Epic Games Store error SU-PQR1603
Launcher prerequisites failed to install
The launcher's self update failed while installing the files it needs, often shown as "The necessary prerequisites have failed to install".
How to fix error SU-PQR1603
Run the Epic Games Launcher as an administrator.
Install all Windows updates.
Download and install the latest launcher from the Epic Games website.
Reinstall the Microsoft Visual C++ Redistributable.
Add -SkipBuildPatchPrereq to the end of the Target line in the launcher shortcut, then run it as administrator.
Turn off your antivirus or firewall for a moment, and turn it back on after.
From Epic Games Store's help pages: epicgames.com, in our words. Checked on 11 November 2026. If the steps do not help, Epic Games Store's own support is the next stop.
More Epic Games Store errors and common problems
- Launcher won't openLauncher crashes or never starts
- Downloads slow or stuckSpeed limit, network or DNS trouble
- Launcher is blankWeb cache or display scaling issue
- Can't claim free gamesThe CAPTCHA won't load or verify
- LS-0013Game is unable to launch
- II-E1003Install failed because files can't download
- MD-DL-0Install download times out
- IS-MF-01File failed to relocate during install
- LS-0018The game is still running
All Epic Games Store errors and common problemsLive Epic Games Store status