High-level steps:
: You must have purchased seats and be provisioned with offline installer access. Download Path
d41d8cd98f00b204e9800998ecf8427e (verify with official sources)
⚠️ This is not an .exe installer but a portable engine folder. To install on an offline PC, simply extract the archive to the same path.
: Includes the Chaos Destruction system for high-performance physics and cinematic-quality visuals.
You did not extract the Engine folder with full permissions. Fix: Extract as Administrator. Ensure your antivirus did not quarantine UE4Editor.exe .