I'm a webmaster since August 2000, and I learned HTML, phpBB, and other web related stuff all by myself and from the Net. But I never encountered web software that is forcing one to upgrade. Zenphoto is, because when not upgraded 3 or 4 weeks after the upgrade came out, my website displays the .../setup.php?autorun=gallery page.
Problem when trying to install 1.4.3.2: the message displayed several unnecessary files. After I clicked the button 'Delete Files', I'm getting a 500 error.
I checked the error log of my site, and some files are writeable by group so I changed their permissions to 644.
Comments
http://www.zenphoto.org/news/installation-and-upgrading#re-running-and-re-uploading-setup-files
http://tv.muscleboykanan.com/1/
You are being asked to re-run the setup process on your existing installation. You would be forced to upgrade only if the change in your environment is incompatible with the release of Zenphoto you are running. Should that be the case, it is not Zenphoto that has forced the upgrade, it is your host or whom ever changed the environment.