: You cannot extract Part 4 on its own. Ensure you have all other parts (Part 1, Part 2, Part 3, etc.) in the same folder before starting.
: If you get a "Checksum Error" specifically for Part 4, try the following: Open the file in WinRAR. Go to Tools > Repair archive . The.Evil.Within.2.part4.rar
If that fails, you likely need to re-download this specific part as the data may have been interrupted. : You cannot extract Part 4 on its own