Many thanks to the Multi-Safari project for working allowing one to use Safari 3 on a system that had been upgraded to Safari 4.
For some reason, Apple chose to not let one uninstall Safari 4 once his system has been upgraded to it. Removing Safari 4 with AppZapper still would not allow me to reinstall Safari 3. Had it not been for Multi-Safari, I’d still be having my issues.
So why did Apple choose such a Microsoft-like approach to the browser? I should be able to uninstall the OS-included browser firstly, and secondly, I should be able to then reinstall the prior version of the same browser.