All Audiobooks in the series, Cleaned, and commonly renamed, then Zipped and renamed to .zab (zab = Zipped Audio Book)

Simply rename the .zab to .zip and unzip, or the neater way is to use a free open sourced media player that plays zips (or zabs)
(like the free/open source Vlc Media Player, download at www.vlcmediaplayer.org/download.html and in the registry just tell it to play/open .zab with vlcplayer)

(Zipping is not for size... not all audiobooks are single mp3 files, some are chapterized or time sliced multiple files, have covers or playlists, or may be formats

other than mp3 (like m4a or flac.... some systems also block zips, and some software (like my calibre) assume zips are ebooks)