Assassins.creed.syndicate.gold.edition.v1.51.in...

: Permanent XP boost and 500 Helix Credits. Technical Specifications (v1.51)

According to the Official Steam Page :

: Join Duleep Singh in 10 new missions to reclaim his birthright. Assassins.Creed.Syndicate.Gold.Edition.v1.51.In...

: Solve 10 exclusive investigative missions (originally a PlayStation exclusive). : Permanent XP boost and 500 Helix Credits

Take over the London underworld during the Industrial Revolution as twin assassins Jacob and Evie Frye. The Gold Edition is the most complete version of the game, including the base title and the full Season Pass . Included Content & DLCs Victorian Legends Pack

: Steampunk Pack, Victorian Legends Pack, and the "A Long Night" mission.