Because this is a file, it is not a standalone installer. It is one piece of a multi-part compressed archive. To use it, you must:
: This era of updates introduced more realistic weapon handling, including improved physical collisions and manual reloading mechanics that felt more tactile in VR. Zero.Caliber.VR.Update..05.01.2020.part3.rar
Have of the sequence (e.g., part1, part2, part3, etc.) in the same folder. Because this is a file, it is not a standalone installer