You cannot extract "part 4" on its own. You must have all pieces of the set to successfully retrieve the content.
: Ensure every part of the sequence (sc24269-EWv105.part1.rar through sc24269-EWv105.partX.rar) is in the same folder . sc24269-EWv105.part4.rar
: Install the unrar package and use the command unrar x sc24269-EWv105.part1.rar . Troubleshooting You cannot extract "part 4" on its own