There are two options to install the mod:
Ensure the game is closed before subscribing. The mod will download and install in the background. After installation, try hosting your own server to see the available mod items.
Find servers with Whale Mod on unofficial server websites or any server that mentions "whale" in the description. Simply join the server, and the game will restart and install the mod automatically.
The most common issue you may encounter is the "mod not fully loaded" error. To resolve this:
steamapps/common/longvinter/mods, then try again.For detailed information on how to run your own server for Windows, Linux, and other platforms, visit the official game website:
Official Server Setup Guide