1. Install AC3
2. Make a backup of your AC3SP.exe
3. Install Benedict Arnold DLC
4. Return your backup of your AC3SP.exe in the main game folder
5. Go to "C:\Users\Your_User\AppData\Local\Ubisoft Game Launcher\savegame_storage\c2tpZHJvdw==\54"
6. Look which one of your 1.save 1.save.metadata or 2.save 2.save.metadata files inside have size 3KB(2KB) and 1KB
6.1. If 3KB(2KB) and 1KB files are 1.save 1.save.metadata copy everything from "54" folder and replace with yours
6.2. If 3KB(2KB) and 1KB files are 2.save 2.save.metadata delete them and rename the ones that left (1.save and 1.save.metadata) to 2.save and 2.save.metadata then copy everything from  "54" folder and replace with yours

Unlocks:
Benedict Arnold DLC
Lost Mayans Ruins Mission
New colours for the Aquila
Upgraded Naval Convoy
Scotish Flintlock
Boarding Axe
Pirate Flintlock
Obawandiyag's War Club
Traditional Colonial Assassin Outfit
Ezio's Outfit
Captain of the Aquilla's Uniform
"Sinking a Secret" privateer contract
"Ghost War" privateer contracts


Credits:
IamAWESOME - for providing dlc saves from original game
Brucie - for decrypting dlc's and providing working emulator
JorjVirus69 - for giving the idea that the save must be decrypted 
tomsons26 - for testing and guideing 
