Really though guys? You would rather use a bunch of sketchy web sites that could inject whatever kinds of ads (or who knows what else, redirects etc) and spy on what you are downloading, than to use a simple awesome piece of software that runs on your computer and downloads the videos you want? As with any free software install, you do have to install with custom options and make sure to uncheck any stupid PUPs or toolbars that it might try to install. I forget if clipgrab has those, but, java and flash have them so, it's a thing people have to pay attention to with any software install.
Personally I won't touch those websites, and even worse are the browser plugins that do it. And I'm sure there are some bad stand-alone programs such as probably the ones the OP was using. But, I vouch for clipgrab. For me it replaced my previous #1 which was Freemake video downloader.