Run the file inside the root folder. (Note: This script will download required core third-party dependencies. To make this completely offline, run Setup.bat once on an online computer, then copy the entire extracted folder to your offline machine).
Launch the Epic Games Launcher. It will read the manifest file, recognize Unreal Engine 4.27 as already installed, and allow you to launch the editor completely offline. System Requirements for Unreal Engine 4.27
Click the icon next to Engine Versions, choose 4.27.2 , and click Install . Let the download complete entirely. Step 2: Copy the Engine Files to an External Drive download unreal engine 4.27 offline installer
Epic has moved to a modular, always-updated delivery system via the launcher to:
While there isn’t a direct, single "offline installer.exe" distributed officially by Epic Games for 4.27, you can easily create your own to distribute across multiple machines or store for future use. Run the file inside the root folder
Once the EOS Bootstrapper is installed, you will use it to fetch the massive UE4.27 binaries.
This method applies to a computer with internet access. Follow these steps: Launch the Epic Games Launcher
(Optional Enterprise Tip: If you want the Epic Games Launcher on the offline machine to recognize the copied files, you must also copy the corresponding .item manifest files found in C:\ProgramData\Epic\EpicGamesLauncher\Data\Manifests from the online PC to the offline PC). Hardware Requirements for Unreal Engine 4.27
Which your offline machines run (Windows, macOS, or Linux) Whether your projects use C++ or Blueprints only