: You cannot use part1 by itself. You must download every single part in the set (e.g., part1, part2, part3, etc.) and keep them in the same folder.
If you are having trouble with a specific error message during extraction or installation, let me know: What are you seeing? Which firmware version is your PS4 running? Are you using WinRAR or 7-Zip ? RESIDENTEVIL3USv1PKG-pkgps4dotcom.part1.rar
: The standard file format used by the PS4 to install games, updates, and DLC. : You cannot use part1 by itself