To update or restore the mpchristmas2017 DLC pack (The Doomsday Heist update) in your GTA V directory, the most reliable "free" method is to use your official game launcher's built-in repair tool. Manually downloading single .rpf files from third-party sites is generally discouraged as it can lead to version mismatches or game crashes. Restoring mpchristmas2017 via Game Launchers
Updating your x64 DLC packs is a relatively straightforward process. Here are the steps: update x64 dlcpacks mpchristmas2017 dlcrpf free