Look for a "Threat quarantined" entry related to Far Cry 4 or uplay_r1_loader64.dll . Select > Restore to put the file back.
The "uplay_r1_loader64.dll missing" error in is usually caused by your antivirus software incorrectly flagging and quarantining the file, as it is a critical component for the game's launcher Step 1: Restore the File from Windows Security how to fix far cry 4 uplay-r1-loader64.dll missing
Method 1: Restore the File from Antivirus Quarantine (Recommended) Look for a "Threat quarantined" entry related to
: Open Windows Security > Virus & threat protection > Protection history . Look for the uplay_r1_loader64.dll file, click Actions , and select Restore . and select Restore .