I just downloaded Malwarebytes v 1.19 from Majorgeeks.com, and just to compare I also downloaded it from the other links provided on the Malwarebytes.org website (see below). The Majorgeeks file is 1,665k while the others are 1,666k. The md5 hash is also different in the Majorgeeks file. http://www.brothersoft.com/download-malwarebytes.-anti-malware-71406.html http://www.majorgeeks.com/Malwarebytes_Anti-Malware_d5756.html http://malwarebytes.gt500.org/mbam.jsp http://www.malwaresupport.com/mbam/program/mbam-setup.exe Two other questions. Why does the Malwarebytes use Brothersoft as its default download site when the Siteadvisor reviews are so questionable? http://www.siteadvisor.com/sites/brothersoft.com/msgpage?page=1#reviews Is Brothersoft as problematic with pop-ups as one reviewer states? I didn't seee any but then again Firefox is blocking pop-ups as is Adblock Plus and my firewall.