A couple days ago I installed the Zen Cart Simple SEO URL add on for a client of mine. The SSU Zen Cart admin page was blank after following the instructions attempting to trigger the final installation steps by visiting a specific page in the Zen Cart admin. It appears I missed reading the “requirements” section of the installation instructions. Below is more information on the problem and how to easily resolve.
Zen Cart Admin >> Extras >> Simple SEO URL Manager = Blank Page
So the issue was that when navigating to the above page via the Extras section of the Zen Cart admin nothing displayed. This means the screen was completely blank. To resolve simply download the Zen Cart Module Manager add-on by clicking here. After downloading the Module Manager add on follow the installation instructions and then pick back up with the Simple SEO URL instructions. This time when you visit the Simple SEO URL Manager page it should display without issue and you can finish installing the Zen Cart SEO URL add on.
I did also run into a couple small issues installing the Module Manager add-on which I will be writing articles about in the near future. Be careful installing it as if you attempt the same steps numerous times you could cause yourself a mini headache.