I was pretty confident when installing this plug-in. I feel anything is simple as far as add-ons go and Zen Cart has helped me with e-commerce solutions pretty well and im excited to give this seo url a go.... I will tell you the two most important things you will need when installing this plugin.
1. The most updated version of module_manager
2. The seo url Version 3.8.5 of simple_seo that is found in the Zen Cart addon section.
3. Did i say make sure you have the most current versions?
**If you don't have correct version you will notice errors and the issue with the .TXT file being .XML..
also FATAL LINE ERROR on 16 is because wrong version of simple_seo i know all this because i searched and searched the form to the answer and the 400+ pages all lead me to one solution and that was to make sure versions were correct..
SSU 3.8.5 all you need to know...