That is an quite important bit of information. We don't and can't support install helpers like Softaculous as we are not involved in those (note on the install page and the forum rules). You have to ask them for support in that. You also should look into your server error logs as they will ask for that most certainly. For 1.4.6 themes need to be updated if not official ones (you didn't say which you use!).
Comments
http://www.zenphoto.org/news/general-contributor-guidelines#reporting-bugs
So I went to the Softaculous website and it said the ZenPhoto App needed updated, so I hit the update button. As soon as I went to our website, http://georgiaypc.com/gallery/zp-core/setup/index.php?autorun=gallery, I got an internal server error.
I am using version 1.4.6
Google Chrome
I hope this helps.
We support only the install way described on our site: http://www.zenphoto.org/news/installation-and-upgrading