The official Warhammer: Vermintide 2 Steam page provides the most stable, up-to-date version.
The filename Warhammer.Vermintide.2.v1.0.3.part1.rar refers to the first segment of a compressed archive containing an older version of the game . Important Note on Game Versions Warhammer.Vermintide.2.v1.0.3.part1.rar
Official progression, loot, and character levels are stored on the developer's backend. Older or unofficial versions typically cannot access these features and are restricted to the "Modded Realm" or offline play. The official Warhammer: Vermintide 2 Steam page provides