Since Epic does not provide a standalone .msi or .exe for the entire 40GB+ engine, the most common way to create an offline installer is to "pre-package" it from an online machine.
Run GenerateProjectFiles.bat , open the resulting UE4.sln in Visual Studio (2019 or 2022), and build the engine. Important: System Requirements for 4.27 download full unreal engine 427 offline installer
that are less hardware-intensive than UE5’s Lumen and Nanite. Method 1: The "Pre-Download" Strategy (Easiest) Since Epic does not provide a standalone