This github organization is based around modding: Sleeping Dogs: Definitive Edition.
If you reading this based on some link reference or just trying to mod the game while using SDK provided at our organization, you will require to download this executable so it's compatible with the SDK (Mod you downloading): sdhdship.exe (Steam).
If you're using GOG Version of the game you will need also this: SteamAPI Offline.
If you're interested in modding the game yourself, we provide enough repositories at this organization that will give you enough information to do mods by yourself.
The main repository you should check out is the: SDK.
If you know how to reverse and use assembly debugger you can get yourself: PDB, this PDB has been in first steam version release and contain every single information about functions & variables names, structs, etc...
If you don't know how to begin to work with SDK or anything there is Base Project that contain basic example of hooking render, game function.