- Gaming and consoles
- PC games and launchers
SU-PQR1603
Epic Games SU-PQR1603 on PC: prerequisites fail to install
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
The Epic Games Launcher self update failed while installing its prerequisites (SU-PQR1603). Run the launcher as administrator and update Windows before reinstalling anything.
Safety first
Stop and check this first
- If you try turning off the antivirus or firewall, do it only briefly and turn them back on even if the problem is fixed, as Epic says; if one of them was the cause, contact its maker.
Safe checks you can perform
- Launcher as administrator and Windows Update
- Latest launcher and Visual C++ Redistributable
- Read and write permissions on the install folder
Leave these tasks to a qualified professional
- Do not attempt this professional task: Epic Games support
- Do not attempt this professional task: PC administrator
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Epic Games support
What they doIf the update still fails with admin rights, Windows up to date, Visual C++ reinstalled and the folder writable, Epic support reviews the exact code and the launcher log.
They must show youthe case number and the cause found.
In writingthe exact code (SU-PQR1603 or other) and the steps already tried.
PC administrator
What they doOn a work, school or shared PC, whoever manages it grants the administrator or write permissions the update needs.
They must show youthe permissions assigned to your user.
In writingwhich permissions were granted and on which folder.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Launcher as administrator and Windows Update
- Who:
- you.
- How:
- right-click the Epic Games Launcher shortcut > Run as administrator. If it fails again, install every update in Settings > Windows Update and restart.
- Result that matters:
- whether the self update finishes without SU-PQR.
- If it finishes as administrator:
- rights were missing. If it finishes after Windows Update: a system component was missing.
- If it stays:
- reinstall the launcher and Visual C++.
- Evidence to keep:
- a screenshot of the error with its full code and the Windows version.
Evidence: How do I fix "The necessary prerequisites have failed to install" error, or SU-PQR error?
Latest launcher and Visual C++ Redistributable
- Who:
- you.
- How:
- download the launcher from the Epic Games website with the Download button and reinstall it. Reinstall Microsoft Visual C++ Redistributable packages from Microsoft's download page.
- Result that matters:
- whether the launcher updates and opens with prerequisites reinstalled.
- If it opens:
- the previous installer or the Visual C++ packages were damaged.
- If it stays:
- check permissions on the install folder.
- Evidence to keep:
- the launcher version installed and the Visual C++ packages reinstalled.
Evidence: How do I fix "The necessary prerequisites have failed to install" error, or SU-PQR error?
Read and write permissions on the install folder
- Who:
- you.
- How:
- go to the install location, right-click > Properties > Security tab, select your username and look at the Allow column.
- Result that matters:
- whether Read and Write are ticked for your user.
- If either is missing:
- your user cannot write there; ask whoever manages the PC to grant it or install to another folder.
- If both are ticked:
- rule out folder permissions.
- Evidence to keep:
- a screenshot of the Security tab with your user selected.
Evidence: How do I fix "The necessary prerequisites have failed to install" error, or SU-PQR error?
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Gaming and consoles
- Brand
- Epic Games
- Product type
- PC games and launchers
Known code variants
- error SU-PQR1603
- No se pudieron instalar los prerrequisitos necesarios
- Self Update Failed
- SU-PQE1223
- SU-PQR
- The necessary prerequisites have failed to install
What it means
Epic Games groups SU-PQR1603, SU-PQE1223 and similar codes as launcher self update failures where the necessary prerequisites, such as Microsoft Visual C++ Redistributable packages, cannot be installed. Epic suggests administrator rights, Windows Update, the latest launcher, reinstalling Visual C++ and checking that you have read and write access to the install folder. The code does not mean a disk or PC fault.
Warnings and stop conditions
- Lowsource verified
If you try turning off the antivirus or firewall, do it only briefly and turn them back on even if the problem is fixed, as Epic says; if one of them was the cause, contact its maker.
Evidence: How do I fix "The necessary prerequisites have failed to install" error, or SU-PQR error?
Symptoms and causes
Probable causes · in order
- No administrator rightsPossible
The installer needs rights to write system components. It is confirmed if the update finishes with Run as administrator.
Evidence: How do I fix "The necessary prerequisites have failed to install" error, or SU-PQR error?
- Windows outdated or Visual C++ damagedPossible
Epic asks you to update Windows and reinstall Visual C++ Redistributable. Suspect it if other programs also fail to install.
Evidence: How do I fix "The necessary prerequisites have failed to install" error, or SU-PQR error?
- No read and write access to the folderPossible
If your user lacks read and write permission on the install location, the update cannot copy files. It shows in Properties > Security.
Evidence: How do I fix "The necessary prerequisites have failed to install" error, or SU-PQR error?
- Antivirus or firewall blockingPossible
Epic lists it as the last step. Suspect it if the error goes away with protection briefly paused and returns when it is back on.
Evidence: How do I fix "The necessary prerequisites have failed to install" error, or SU-PQR error?
Virtual technician
Does SU-PQR1603 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
How do I fix "The necessary prerequisites have failed to install" error, or SU-PQR error?
Epic Games · 2026 · official_doc
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