If you are stuck on a "Prerequisites failed" screen, the community recommends: Install Unreal Engine - Epic Games Developers
: Installation requires admin privileges, which can be a hurdle on restricted or work computers. ue4-prerequisites-x64-download-softfiler
1. Purpose and Origin
: The installer may claim a restart is required but continue to show the same error message after rebooting. If you are stuck on a "Prerequisites failed"