If you already have a version of CRYENGINE installed, you can use the Launcher without an active internet connection. Initial Setup : You must first install the CRYENGINE Launcher and download at least one engine version while online. Entering Offline Mode : On the Launcher login screen, click the Offline Mode button in the bottom-right corner. Restriction : You cannot download
Crytek provides official offline installers through their or via direct download from their member portal (for licensed users). For the free indie tier, you can still generate an offline package by downloading the engine once via the launcher, then backing up the installation folder. cryengine offline installer
Once you have acquired the offline installer (let's assume a .exe or .7z file), follow these steps: If you already have a version of CRYENGINE