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
Do you need the to apply this update to your game directory, or
Open only part1.rar using a tool like WinRAR or 7-Zip . The software will automatically pull data from part4.rar and the others to reconstruct the update installer or game files.
Watch Dogs 2 - Title Update 1.16 (4 Player Co-op, Fireworks, & More!) - YouTube. This content isn't available. YouTube·UbiCentral