How To Fix Uplayr1loader64dll Error In Assassin 39s Creed Unity New May 2026

Most modern versions of Windows Defender or third-party antivirus software flag this specific DLL as a threat and move it to quarantine.

Open (or your specific antivirus software). Go to Virus & threat protection > Protection history . Locate the entry for uplay_r1_loader64.dll . Click Actions and select Restore . Most modern versions of Windows Defender or third-party

Some versions of the game include a backup of the necessary DLL files within the installation directory itself. Navigate to your main Assassin’s Creed Unity game folder. Locate the entry for uplay_r1_loader64

Look for a subfolder named or 3DM (common in specific digital distributions). Copy the uplay_r1_loader64.dll file found there. Navigate to your main Assassin’s Creed Unity game folder

Download the latest version of the Ubisoft Connect Desktop App.

Because this DLL is a part of the Ubisoft Connect (formerly Uplay) ecosystem, a corrupted client can cause the error.

To prevent it from happening again, add the Assassin’s Creed Unity installation folder to your antivirus list. 2. Manual Replacement from Game Folders