During the past weeks, I have deligently picked up much knowledge about CD/DVD copying and the vast variety of tools available to accomplish the tasks. Just feeling the urge to improve my understanding of the relevant topics on CD/DVD duplication, ripping, and compression.
There are certainly few mentions around the places about "DiscJuggler" as compared to Nero Burning ROM (and Nero Express), CloneCD, BlindWrite Suite, Alcohol 120% (and Alcohol 52%), CDRWin, DVD Decrypter, SmartRipper, DVD Shrink, DVD X Copy Express, etc.
This probably why nobody responds to your query on "DiscJuggler" error message during installation.
But your posting inspired me to visit the website of "DiscJuggler" and I thought it may be a worthwhile tool to explore in future. The developer seems committed to improving its features and interface on a continuous basis.