Wow!
Ok if you have a Mac the only thing you have to do is save all the previous versions you download as dmg's. I keep them in a folder that I burn later to DVD as archives of all my old software.
If a newer version gives you problems then just delete the application and re-install one of the older versions.
The application is self contained. Deleting it does nothing to change the preferences or your book library.
Happy Saturday
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