If "Something is creating script errors," suggest a clean installation as a fix.

Garry's Mod: How to install E2 & Advanced Duplicator 2 Files [.txt]

If it’s a standard mod, move the folder to garrysmod/addons/ .

Recommend gmpublisher for analyzing or extracting compressed addon contents.

Define what this "hack" or mod does (e.g., a custom tool, a Hammer++ configuration, or a specific Lua script ).