According to my PC (Windows 7) the save games are located as follows... "C" (or your hard drive letter), Program Files (x86), Steam, steamapps, common, SleepingDogs, Data. Then, either Autosave Slot, or GameSlot 1.
Hope this is helpful.
there is my save - www.mediafire.com/?nz1wedadxaxlgfr
Just put the file as followed BMedcom's instruction.