Right-click the game in your Library , select Properties > Installed Files > Verify integrity of game files . 4. Update Supporting Software

“The program can’t start because uplayr1loader64.dll is missing from your computer.”

2026 Applies to: Windows 10, Windows 11, Steam, Epic Games, and Ubisoft Connect versions

The game finds the DLL missing, corrupted, blocked by antivirus, or when the Ubisoft Connect client fails to launch it correctly.

The UplayR1Loader64.dll error can occur due to various reasons. Some of the common causes include:

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