Note: This article describes components of an older release of QuickTime, 2.0.
I am not sure what you mean by QT Convert. I cannot find QT Convert on any CD-ROMs that Apple has distributed. Did you mean Convert to Movie 1.0 or Movie Converter 1.0?
If so, the latest version of these tools is ConvertToMovie and it is available in a book and CD-ROM bundle called "QuickTime - The Official Guide for Macintosh Users" by Judith Stern & Robert Lettieri from Hayden Books. This CD-ROM also has several other good QuickTime tools such as MovieShop and MovieAnalyzer.
There are additional developer QuickTime tools available from APDA and online from Apple Computer.