There are a number of programs to choose from, but unfortunately you have to be careful on installing many of them, as they come with "optional" programs as well in the installers. Always choose to do a custom installation and be very careful not to allow anything else.
Freemake Video Downloader is one such program, and you certainly have to be careful with it.
Video DownloadHelper is an add-on for Firefox browser, so it is a safer choice, and VSO is a reputable company that has a downloader program, which you can see here: http://www.vso-software.fr/products/downloader/vso-downloader.php?ap=avangate&aid=675
I haven't used such a program for quite a while now, but the last one for me was the Video DownloadHelper extension for Firefox.