Ensure you have part1.rar through the final part in a single directory.
Open the extracted folder and locate the Chivalry2.exe (usually found in Binaries/Win64/ ). Chivalry 2 v1.0.29.0.part5.rar
The file is one segment of a multi-part compressed archive containing the game files for the medieval multiplayer slasher, Chivalry 2 . Ensure you have part1