Finding a can be tricky because Epic Games primarily distributes the engine through the Epic Games Launcher. However, for developers working in air-gapped environments or those with unstable internet, there are two legitimate ways to secure a complete offline setup.

For a truly smooth offline installation, don't forget to download and carry the and DirectX End-User Runtimes . Without these, the engine may fail to launch on a fresh Windows installation regardless of how you downloaded the editor.

If you need a "cleaner" offline installer or require custom modifications, downloading the source code from GitHub is the professional route.

Copy this entire UE_4.27 folder to an external hard drive.

Before clicking install, click the Options dropdown. Ensure you check all the components you’ll need offline (e.g., Android/iOS Support, Linux, Starter Content, and Engine Source).