The absolute highest-success fix requires manually clearing the specific local save string IDs.

Right-click the Watch Dogs 2 desktop shortcut or the main executable file (.exe) in your installation folder. Select Properties from the context menu. Click on the Compatibility tab. Check the box next to Run this program as an administrator. Click Apply, then click OK. Launch the game to check if it bypasses the loading screen. Disable Cloud Save Synchronization

The launcher itself often causes the profile hang.

If the issue is network-related, enabling UPnP (Universal Plug and Play) helps your router communicate better with Ubisoft servers.

Right-click and choose Run as Administrator .

SavePath=C:\Users\[YourName]\Documents\My Games\Watch_Dogs 2 Save the file and relaunch. Delete Existing (Corrupted) Save Data

This is done by adding a launch argument to the game: