You can safely cancel or close the setup wizard. The game should launch normally because your existing, newer libraries are backward-compatible.
Developers and power users can invoke the executable with command-line arguments for automated deployments:
This status code indicates an architecture mismatch (32-bit vs 64-bit) or a corrupted download. ue4prereqsetup-x64.exe
Right-click on the file, select Properties , and navigate to the Digital Signatures tab. A legitimate file will list Epic Games, Inc. as the signer. If the signature is missing or belongs to an unknown entity, run a full system scan with your antivirus software immediately. Common Troubleshooting and Error Fixes
These are sets of runtime components required to run apps developed with Visual Studio. You can safely cancel or close the setup wizard
Developers use this to ensure that after the libraries are installed, the system immediately reboots to finalize the registry changes, ensuring the game or editor runs perfectly on the next launch. Why this matters
While the exact components can vary slightly depending on the specific Unreal Engine 4 version, the UE4PrereqSetup_x64.exe usually installs the following: Right-click on the file, select Properties , and
When executed, this tool does not install Unreal Engine itself, nor does it install the Epic Games Launcher. Instead, it silently orchestrates the installation of a specific, non-negotiable list of Microsoft runtime libraries and components. The most critical among these are the (specifically multiple versions, including 2015, 2017, and 2019, as they are often cumulatively required) and the DirectX Runtime . Without these, an executable compiled by the Unreal Engine—whether the editor itself or a packaged game—would fail to launch, generating cryptic errors about missing DLLs like MSVCP140.dll or XINPUT1_3.dll .
Corrupted Microsoft Visual C++ installations frequently cause this setup tool to fail.
Here is a detailed technical and practical breakdown of what this file is, why it exists, and what it does.
This common error occurs when a previous installation of a Visual C++ Redistributable is pending a system reboot, or another installer is already running.