A desktop shortcut can be created when installing but use any methods you like to quick access the tools.On the same page as installing the mod tools, right click them Properties → DLC → BOIII Mod Tools - Additional Assets and tick the 'INSTALL' box. You may also want to install extra assets which include more models and textures.Then go to your Steam Library → Tools → Call of Duty: Black Ops III - Mod Tools and install.You need to own Black Ops 3 on Steam, this is the only way to own a PC version of the game.