The engine contains binary .uasset files which are stored via Git LFS.
cd UnrealEngine
git lfs pull
Note: This may take 3-6 hours depending on your speed. The result is a full, uncompressed Unreal Engine 4 root folder.
Many users mistakenly search for "UE4 offline installer exe" and find malicious fake files. There is no official .exe installer. Instead, Epic provides the complete source code and build tools via GitHub. You must generate the installer yourself. Unreal Engine 4 Download Offline Installer
An offline installer, also known as a standalone installer, is a self-contained package that allows software installation without an active internet connection. For Unreal Engine 4, this means you can install the engine, its core features, and essential tools on your computer without needing to download anything from the internet.
Open Command Prompt or Terminal. Navigate to your external drive (e.g., D:\UE4_Offline). Run: The engine contains binary
git clone --branch 4.27 https://github.com/EpicGames/UnrealEngine.git
(Replace 4.27 with your desired version, though 4.27 is the final stable UE4 release).
On your target PC (with no internet):
Click "Install". Let it run for about 10 seconds until it creates the folder structure. Immediately click "Pause".
Once the clone is complete, compress the folder into a multi-part archive: Note: This may take 3-6 hours depending on your speed
You now have UE4_4.27_Offline.7z.001, .002, etc. This is your portable offline installer.