Epic Games does not provide a public "one-click" .exe for individual offline installation. However, there are two official ways to achieve this for organizations and advanced users:
Always cross-reference the hash with the official Unreal Engine forum post titled "Unreal Engine 4.27.2 Release Notes" (last updated June 2022). download full unreal engine 427 offline installer
You install the engine once, then copy the installation files. Install the Epic Games Launcher on a machine with internet. Navigate to the Unreal Engine tab > . Epic Games does not provide a public "one-click"