If you don't have enterprise access, you can manually create a portable version to move to an offline machine:
Below is a draft guide outlining the available methods to obtain an offline-ready version of UE 4.27. 1. Official Offline Installer (Enterprise Only) download full unreal engine 427 offline installer
Epic Games maintains public on GitHub. This method is the most reliable for downloading raw engine files without the launcher. If you don't have enterprise access, you can
Manually delete the DerivedDataCache folder in your project and restart the engine. The offline installer may have partial cached data. If you don't have enterprise access