If you have ever installed Unreal Engine 4 (UE4) via the Epic Games Launcher or built it from source code on GitHub, you have likely encountered a small, often-overlooked popup window titled "UE4 Prerequisites x64." For most users, this is a fleeting moment—a click of the "Yes" button, followed by a UAC prompt and a successful installation. However, for developers facing runtime errors,打包 (packaging) failures, or deployment issues on target machines, understanding the is not just helpful; it is essential.
Open Control Panel → Programs and Features. Uninstall all existing: ue4 prerequisites x64 setup exclusive
Occasionally, this setup can get stuck or fail. Here is how to fix common issues: If you have ever installed Unreal Engine 4
Some users see the same 2-second installer popup every launch — not because something failed, but because the launcher never stores a persistent “already checked” flag. It’s an intentional (if annoying) robustness feature. Uninstall all existing: Occasionally, this setup can get
: In most packaged games, you can find the installer at: [GameFolder]\Engine\Extras\Redist\en-us\UEPrereqSetup_x64.exe
If the UE4 Prerequisites setup fails with errors like 0x80070643 or 0x80070001 , use these proven fixes: