This tip is from Narendra Sankar in Quicken 2004 Tips & Tricks which I found works for Quicken 2003 quite nicely. Change the browser in Crossover Office setup - change the default browser from auto to your Unix browser (/usr/bin/mozilla in my case), and set that as default for windows application. Narendra says that you can register online after this change (I have not tried this yet).
The big thing here is that a lot of the nag screens are gone, and updates are very smooth.
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