The official Warhammer: Vermintide 2 Steam page provides the most stable, up-to-date version.
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. Warhammer.Vermintide.2.v1.0.3.part1.rar
Modern multiplayer for Vermintide 2 requires the latest official patch to connect to Fatshark's servers. The official Warhammer: Vermintide 2 Steam page provides