Copy the entire UE_4.27 folder to your external storage media. Step 3: Register the Engine Offline on Target Machines
Move this archive to a USB flash drive, external hard drive, or local Network Attached Storage (NAS). download unreal engine 4.27 offline installer
If you have purchased assets from the Unreal Engine Marketplace, you cannot directly download them offline. To use them: Download the assets on a machine with internet access. Create a temporary project and add the assets to it. Copy the entire UE_4