If you are using a digital platform like Steam, it's often safer to Verify Integrity of Game Files through the game settings to automatically repair any corrupted update data.
It looks like you’re dealing with a specific multi-part archive for a update. Based on the file naming convention, this is part of the v1.17 Title Update , which focuses on bug fixes and technical stability. Update Overview: Watch Dogs 2 v1.17
The v1.17 update was a maintenance patch released by Ubisoft to address community-reported issues.