If you are downloading a backup save file or backing up your own progress before attempting 100% sync, you can find the save directories here:
Most save game repositories (Nexus Mods, MrAntiFun, etc.) offer "End Game" or "100% Sync" saves. These are useless for Sequence 6, because: --- Assassin 39-s Creed 3 Save Game Sequence 6
Because Assassin’s Creed 3 relies heavily on an autosave system, many players look for specific "Sequence 6 Save Games" online. This is often done to bypass the incredibly long prologue or to replay the sequence with different gear. Why Players Search for a Sequence 6 Save If you are downloading a backup save file