Perhaps I have done more things 'wrong' than I thought...
First, after uploading all the new files, I went to the base directory and viewed the album ( The guide says [i]Setup.php will run[/i], but it does not do this automatically!). Then I saw that the albums were not showing. Then I ran upgrade.php... and after that setup.php.
Perhaps there can be made a few additions to the upgrade guide:
# Backup your MySQL database.
# Remove the “zen†or “zp-core†folder and the files in the home dir within your installation taking note of the database credentials in your zp-config file, you will need it in step 4
# Download the latest version and upload it to your server [b]and make sure the .htaccess file is writable[/b]
# Once the files are uploaded, go to [b]yoursite.org/gallery/zp-core/setup.php[/b]. Follow the instructions.