: All parts (except the very last one) should usually be the exact same size. If one is smaller, the download might be corrupted.
: This is likely a unique ID or hash used by the uploader. In many online communities, these strings are used to avoid automated copyright filters or to identify specific "releases." S2ckb0yDODI2GB.part04.rar
: This confirms the file is part of a "split volume." You need Part 01 through at least Part 04 (and likely more) to extract anything. : All parts (except the very last one)