I got the install package here. I am 100% certain all files copied correctly and that all old files were deleted. I uploaded the index.php that came in the zip file to replace the GPL index.php that was there after installation. (It was just plain text; it was as though license.txt had been copied directly over index.php.) I followed the directions here exactly.
It does work, now, without any apparent problems, even using my highly-customized theme and numerous plugins. The blog itself is at https://www.edcottrell.com/edblog/, if you feel like taking a look. The install process I had to go through was definitely a major hassle, though. At various stages, I got anything from blank pages to a never-ending loop on upgrade.php, which told me, “Your database is out-of-date. Please upgrade.”
Also, I have done numerous clean installs of every version of WordPress from 1.2 to 2.0.2, without problems. Every upgrade I have ever done has been a hassle, though; maybe not this bad, but not good, either. More time needs to be spent insuring the upgrade process runs as smoothly as the install process.