Was trying to upgrade the plugin, and kept getting redirected to a 404 error. So then I deactivated it, intending to upgrade it manually, and now I can't even get it activated again- when I try, I am once again redirected to a 404 page.
I have tried turning off all plugins, and it still won't activate, so it doesn't seem to be a plugin conflict.
My client really wants this plugin, as it's the most comprehensive- let me know what info I can get you that will help you troubleshoot this issue. Thanks!