The -x64 in the name is critical. UE4 abandoned pure 32-bit development early in its lifecycle. Modern UE4 projects are built exclusively for 64-bit architectures. This installer ensures that the 64-bit versions of the above runtimes are installed, not the legacy 32-bit ones. If you try to force a 32-bit runtime on a UE4 game, the engine will refuse to launch.
Unreal Engine 4 dropped official support for 32-bit (x86) applications years ago. Modern game development demands large memory address spaces, complex physics calculations, and high-resolution textures—all of which require a 64-bit processor and operating system. Ue4 Prerequisites -x64- Setup
Thus, the UE4 Prerequisites -x64- Setup exclusively installs 64-bit versions of: The -x64 in the name is critical
If you are running a 32-bit version of Windows 10 or 11, you cannot install or run UE4. The setup will fail with an architecture mismatch error. Unreal Engine 4 dropped official support for 32-bit
Pro Tip: Always verify your OS is 64-bit by going to
Settings > System > Aboutand checking "System type."
Cause: The installer attempted to write to C:\Program Files or the Windows Registry (specifically HKLM\Software\Microsoft\VisualStudio), which requires elevated privileges.
Fix: