Hi Guillermo, > I'm trying to add QBzr to the 10.4 Installer, how do you test for > the existence of a installed Qt4 and PyQt4. I'm just checking for the existence of the following file: /Library/Python/2.5/site-packages/PyQt4/pyqtconfig.py This could be somewhere else on a Tiger system, I don't know... Cheers, Szilveszter