: Tools like gmpublisher or GModPatchTool are used for legitimate mod management and patching. Security Warning
: Servers can be configured to automatically download and update Workshop add-ons for players using a workshop.lua file.
For a safe and official guide on how to automatically manage and download add-ons for your game, watch this tutorial:
The file appears to be a third-party archive or "cracked" version of the game, often associated with unofficial distributions that bypass the standard Steam Workshop and update system. Official ways to manage and update Garry's Mod include: