I tried this plugin several times on my sites and the HTTP mode will not work. It just redirects you back to the main site. The other mode will however work. I really wanted the HTTP mode so I'm forced to find another solution.
I purchased this and at first it caused a conflict in my CSS. I sent an email to the support and they replied within 15 min. They hopped on my site and got my fixed up and running in a flash. Great module, great service behind it!