If the game won't launch, try running it in Windows 7/8 Compatibility Mode or as an Administrator via the application properties.

Watch_Dogs® 2 - Watch Dogs 2 – 1.17 Patch Notes – Bug Fix Patch - Steam News.

Watch Dogs 2 - Title Update 1.16 (4 Player Co-op, Fireworks, & More!) - YouTube. This content isn't available. YouTube·UbiCentral

Ensure you aren't missing any .rar files in the sequence.

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