The original RELOADED crack had a specific bug where quitting the game immediately after a manual save would corrupt the save file. V1.05-RELOADED rebuilds the save handler, ensuring that save files are properly flushed to the disk before the executable terminates.
If you are looking for specific legacy patch notes for the 2013 original (such as for archival or modding purposes), you can find technical breakdowns on PCGamingWiki or the official Ubisoft Support portal . Assassins Creed IV Black Flag Update V1 05-RELOADED