The Transparent Language Vocabulary Master CD Softwareoffers a comprehensive language-learning system that is accessible through a web browser or mobile apps, with interactive lessons, speech activities, and vocabulary tracking.About the CD-ROM softwareThe CD-ROM was a language-learning software developed byTransparent Language.It used interactive exercises and lessons to help users learn new languages.The format was designed to work on both Windows and Mac operating systems.What version of Windows and/or Mac are you running? It is an older version of software so you probably need to run it on an older version of Windows/Mac. Do your due diligence before buying.