Instructions on using save files for Assassin's Creed III Black Flag:
1. Download desired Assassin's Creed 3 save game file to your desktop.
2. Uzip it using WinZip or any similar tool. Right click on extracted "1.save" file and select "Copy".
3. Navigate to Assassin's Creed III save location: C:\ProgramData\Orbit\54
and paste file here.
4. Start the game and load first profile.
For brand new game installation:
If you have a brand new game installation
(which means you didn't play game before using downloaded savegame), it is recommended to start the game, and exit right after the first mission starts.
Do it before following the instructions above. This method will create necessary files within the game save directory.