Ensure you have downloaded every part (e.g., part01 through partXX) and placed them in a single folder.
Large games are often split into smaller "parts" to make downloading easier. You cannot use part03 alone; you must have all parts in the same folder to reconstruct the full game. How to Use This File SCUM.build.10200561.part03.rar
This file name indicates a manual backup or a non-official distribution (often found on third-party sites or for version rollbacks) of the game. Ensure you have downloaded every part (e