1) Place checksums.exf and TestFiles.exe in the same folder as the promods-v2**.7z.00* files.
2) Run TestFiles.exe
3) The result must look like TestFiles.jpg, if this is not the case, find the problem and download the corrupt file again.

NOTE: ALWAYS USE THE LATEST VERSION OF 7-ZIP ( http://www.7-zip.org/download.html ) TO EXTRACT