Qt 4.5.3 for Mac uninstall required before installing Qt 4.6

Here's something pretty subtle that I hadn't picked up. In the install notes, it tells how to perform the uninstall:

"You can later run the uninstall-qt.py script to uninstall the binary package."

sudo /Developer/Tools/uninstall-qt.py

I had to do this prior to installing Qt 4.6 over Qt 5.3 because Qt decided to store the app into /Developer/Applications/Qt/QtCreator without (of course) removing the old one.

In Windows, they install it directly into the C: directory, into a subdir with the version number. I'm wondering how (if?) they'll support multiple active versions on the Mac.