No, the software can't be used to translate Marathi Voice to text. In fact, Itranslator 99 is used to convert ITRANS 5.30 encoded text or text files into Devanagari or Transliteration script (True Type). I have searched its help file and all the documents, but it doesn't say anything related to Marathi and voice translation.
However, the best way to get additional information is by visiting the official website. You have all the information posted there: http://www.omkarananda-ashram.org/Sanskrit/itranslator99.htm#downloads