If your organization has purchased Unreal Subscription seats, administrators can download standalone installers directly from the Epic Developer Portal.
Use the Epic Games Launcher to install Unreal Engine 4.27 on a computer with a fast internet connection. download unreal engine 4.27 offline installer
Copy the folder onto your offline machine. How to Download Unreal Engine 4
How to Download Unreal Engine 4.27 Offline Installer Whether you are working in a restricted network environment, managing a classroom, or simply dealing with a slow internet connection, finding a way to download an is a common challenge. While Epic Games primarily pushes the Epic Games Launcher for all installations, there are several official and community-tested ways to obtain a standalone version of the engine. 1. Official Enterprise & Educational Offline Installer standalone version without the launcher
Launch the engine directly by running UE4Editor.exe located in Engine/Binaries/Win64 . 3. Building from Source (GitHub)
For users who need a clean, standalone version without the launcher, building from the source code is the most robust option. Offline Installer of Unreal Engine - Epic Games Developers