-x64- Setup — Ue4 Prerequisites

It sounds like you're referring to the installer that often runs when you first install or launch Unreal Engine (especially packaged games or the engine itself). This setup installs required VC++ runtimes, DirectX, and other low-level dependencies.

UE4PrereqSetup_x64.exe /quiet /norestart To check if already installed, look for registry keys under: HKLM\SOFTWARE\Microsoft\VisualStudio\14.0\VC\Runtimes\x64 | Problem | Likely fix | |--------|-------------| | Setup fails / hangs | Run as Administrator, disable antivirus temporarily | | “Windows 8.1 or later required” | UE4.27+ needs Win10/11. Older UE4 versions support Win7 | | VC++ error 0x80240017 | Install the VC++ redist manually from Microsoft | | Prerequisites loop on every launch | Delete %localappdata%\UnrealEngine\Common\PrereqInstall and re-run | | Game says UE4PrereqSetup failed | Extract the game, find the setup file, run it manually | 5. Checking if prerequisites are already met Run this in PowerShell (Admin) to see if VC++ 2015-2022 x64 is installed: Ue4 Prerequisites -x64- Setup