I am trying to install with zen cart v.1.3.9d. Has anyone had success doing a full install with this version of zen cart. My admin won't show my ssu.php page to install the program it says page not available. Basically it's a 500 error page (not available). I can look in my FTP and see the file exists. I tried to increase file permissions but then it just redirected the admin: Simple SEO URL manager to my website front end home page.

Don't know why this will not install at all and I get a 500 error when I click the link to install when that page is there.