If you haven't heard of CNET Download.com, it's a infamous website that offers software for download free, with a catch-you need to make it through a sponsored installer that offers you optional software before the actually software installation starts. There's a lot of malware and adware (hi-jackers, toolbars, etc). I noticed that when I run these sponsored installers, Malwarebytes doesn't detect it. You can download sponsored installers from Softonic and similar websites but Malwarebytes will delete those. Why aren't Download.com installers detected?