Open your web browser and go to the official CRYENGINE GitHub releases page: https://github.com/CRYTEK/CRYENGINE/releases . This page lists various preview builds, long-term support (LTS) versions, and historic releases.
If the Launcher fails to update, even when you have an internet connection, manually perform the update by renaming two folders.
When setting up an offline environment, be mindful of the following legal and practical points:
Once the engine files are on your offline machine, you need to configure your projects to recognize the engine without relying on the cloud. Creating Projects Offline