: To use the compiled "piece" of software, you need an injector to insert the DLL into the gmod.exe process. Basic Usage Steps

: The SDK is usually compiled into a .dll file, which contains features like Aimbot, ESP, and Triggerbot.

It looks like you're referring to an x64 version of the Gaztoof GMod-SDK , a software development kit often used for creating or updating cheats for Garry's Mod.