After installing the free version and noticing that it worked at helping to prevent malware from being placed on my site I decided to upgrade to the premium version. I figured that it would be nice to have the extra security offered and the extra scanning for malware. Upon upgrading to the premium version everything was great. I logged out and turned my computer off. The next day I was not able to log back into my site. Every time I went to my log in page I was redirected to my home page. When contacting the person that wrote the plugin I was told that the only reason that would happen is if my site already had malware installed. I went and scanned my site with Sucuri and Google Webmaster tools. According to each scan nothing malicious was found on my site. I am sure this is a great plugin to keep EVERYONE out of the site including the site owner. Sorry but the plugin author did not seemed concerned in helping me fix this problem. I have deleted the plugin via my FTP and I have requested a refund. If I do not get a refund I will fill a complaint with the BBB & my credit card company.