Sometimes the launcher itself becomes corrupted. Fortunately, you can reinstall Ubisoft Connect without touching your 40GB Watch Dogs 2 installation.
This might disable multiplayer features but should allow the single-player campaign to launch immediately. 2. Admin Privileges & Compatibility unable to locate uplay pc watch dogs 2
If your Steam account isn't properly linked to your Ubisoft account, the game can't verify your license, leading to the error. Sometimes the launcher itself becomes corrupted
A recent and frustrating variant of this error involves an Easy Anti-Cheat warning about an "untrusted system file," specifically uplay_aux_r164.dll . This file is part of Ubisoft Connect, but EAC occasionally flags it as suspicious, blocking the game from launching. This file is part of Ubisoft Connect, but
Watch Dogs 2 is an open-world action-adventure game developed by Ubisoft. Unlike self-contained executables, modern Ubisoft titles rely heavily on a centralized launcher infrastructure (Ubisoft Connect/Uplay). The error "Unable to locate Uplay PC" indicates a failure in the handshake protocol between the game executable ( Watch_Dogs 2.exe ) and the launcher executable ( upc.exe ).