I've just now tried installing QuickBooks Pro '07 for Mac which I purchased in an Apple retail store last month. It won't install. My box meets all requirements, running 10.4.8, 22 Gb of HD space, etc, etc. I've checked all the Troubleshooting, gone online to Support, no answers, other than calling their 888 number to see what's up. Has anyone else had difficulty with QuickBooks? (double clicking on app icon installed from CD in Applications folder, and nothing opens.) First time for everything.