As described here, I have have not been able to install Module Manager that Simple SEO URL requires. Thank you to countrycharm for suggesting that I rename admin directory in the module_manager directory from admin to the adminxxx to match the secret name of my zencart admin directory.

However, that change produced no observable effect. So I still need help. What should I do? Thank you.

PS. Should I restore the name of the subdirectory /module_manager/adminxxx/ back to its original /module_manager/admin/ ?