I've checked and the website listed as the official one for iKaraoke TunePrompter doesn't have anything about it which could also mean that the software is now discontinued. I've also used their search feature to find the TunePrompter, but there were 0 results.
You'll have to contact the developers to obtain additional information related to the availability of iKaraoke TunePrompter for updated versions of Mac OSX.