You need two specific files: uplay_r164.dll and uplay_aux_r164.dll .
Permission conflicts between Steam and Ubisoft Connect frequently cause launch failures.
When you launch Watch Dogs 2 from Steam or Epic Games, the platform must call upon Ubisoft's background architecture to verify ownership and load digital rights management (DRM) protocols. The "Unable to locate Uplay PC" error pops up due to three main culprits: unable to locate uplay pc watch dogs 2
Open your web browser and log into the portal.
Privilege conflicts frequently cause this error. Giving both applications administrative rights ensures they can talk to each other without Windows blocking them. You need two specific files: uplay_r164
This is the most common and effective fix for this problem. Even if you think Ubisoft Connect is installed, a fresh manual installation can resolve a multitude of hidden issues.
It usually happens because the game is looking for the old "Uplay" launcher, while your system likely has the rebranded Ubisoft Connect The "Unable to locate Uplay PC" error pops
Ensure the "Start In" field points to the folder containing the executable, usually: C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher
If you are trying to launch Watch Dogs 2 and are suddenly greeted by the frustrating error message you aren't alone. This is a common issue that typically pops up after a platform update, a fresh install, or when trying to launch the game via Steam.