In some cases, verification fails to replace the file, or the game requires a specific version of the DLL that the launcher isn't providing. In this scenario, manual intervention is required. It is important to note that downloading DLL files from random websites is a security risk; however, obtaining the file from a trusted source or a game-specific fix pack is often the solution.
If you'd like to check your against the game's requirements to rule out compatibility issues, just let me know. how to fix far cry 4 uplay-r1-loader64.dll missing
Sometimes, Steam and Uplay lose their handshake. This resets the connection. In some cases, verification fails to replace the