they should have the current and past versions available.
As far as not messing with QT3, all I can say us that after the install of QT2 is completed. Then check the sym link /usr/lib/qt and if it is pointing to the new qt-2.3.2 directory then change it back to the qt-3.0.4 directory.
ln -s /usr/lib/qt-3.0.4 /usr/lib/qt
should do it. It would probably be best if you not running X at the time you installed QT2.