This method allows you to download the engine as a ZIP file on a machine with internet access and transfer it to an offline PC. You will need to "build" (compile) it yourself.
Epic Games provides a dedicated offline installer specifically for and Enterprise Subscription users. Unreal Engine 4 Download Offline Installer
In this guide, we will walk you through the official and community-approved methods to get UE4 up and running without a persistent internet connection. Why Use an Offline Installer for Unreal Engine 4? This method allows you to download the engine
Unreal Engine 5 (UE5) has largely replaced UE4. However, many studios stick with UE4.27.2 for long-term projects. The same offline cache method works perfectly for UE5 as well. Unreal Engine 4 Download Offline Installer