How to install the Sleeping Dogs Definitive Edition Mod Menu (GOG users check description)

GOG USERS: You will also need to download an additional file from the same link as the mod menu called «SteamAPI_Offline», and place it in the same folder as the mod menu. I've gotten this question several times, and I figure it will probably just continue, so I might as well just make a little video explaining exactly how to do it.