Current version is 4.3.1 from 2015-11-25 (What is new)
Supported versions of Windows: XP SP2, Vista, 7, 8, 10, Server 2003, Server 2008
Audiobooks with subtitles on this website:
Also a huge number of audiobooks in all languages: LibriVox.org
Also you can use
Audio Tracks from Movies and
Audio Tracks from YouTube
All this you can use with WorkAudioBook!