Sometimes the Uplay/Ubisoft Connect client itself breaks the DLL hook.
If the error persists across multiple games, there may be an issue with your Windows environment.
Open your antivirus software (Windows Defender, Malwarebytes, etc.). Navigate to the or Threat History section. Sometimes the Uplay/Ubisoft Connect client itself breaks the
Elias dug deeper into the forums. He realized the issue: Assassin’s Creed Unity was an older game. It was built in the era of the old "Uplay" launcher. Over the years, Ubisoft had transitioned to "Ubisoft Connect." While the new launcher was installed, the old legacy files the game relied on—specifically the R1 loader—were sometimes missing or disconnected during updates.
Click the , type Windows Security , and press Enter. Select Virus & threat protection . Click on Protection history . Navigate to the or Threat History section
What (Windows 10 or 11) is your PC running? Share public link
How to Fix "uplay_r1_loader64.dll Missing" Error in Assassin’s Creed Unity It was built in the era of the old "Uplay" launcher
Click the Shield icon in your taskbar or search for "Windows Security" in the Start menu.
As a last resort, you can download the file manually, though this is less recommended due to potential security risks. Download the 64-bit version of uplay_r1_loader64.dll from a reputable source like DLL-files.com Extract the ZIP file and copy the Paste it into the Assassin's Creed Unity main installation folder Uplay r1 loader64 dll missing or not found Fix
The DLL depends on Visual C++ runtimes.