We recommend using the latest version of WinRAR or 7-Zip . Older versions may occasionally throw "Checksum errors" on newer .rar archives.
Ensure you have Parts 01, 02, and 03 (and any subsequent parts) in the same folder . 12.0 - XYZ.part03.rar
you'd like me to swap for "XYZ" to make this post more authentic? We recommend using the latest version of WinRAR or 7-Zip