From Media Freeware:
Free Youtube to MP4 Converter form Media Freeware is a Youtube downloader mixed with a video converter that will download your favorite Youtube videos and convert them to MP4 file format. The app has many useful features which makes this app a must-have application for those who want to have Youtube videos on their PC. When you import a link, the app checks it for validity and if it is a Youtube video link, then it will be added to the download list. The number of imported links can be more than one and the app download and converts them simultaneously. There is an "Add Bulk URL" button which imports a list of Youtube links one at a line and prior to downloading it checks all links for validity and then adds them to download list. There is a Search tab for searching specific videos and the results can be added to download list. The Settings tab has many parameters to set and make the app work the way you want to. If you connect to internet through a proxy server, then you can enter your credentials which is in Settings tab and let the app download videos through that proxy server. You can specify the number of parallel downloads as well. So if you have a low speed internet connection then you can decrease them to avoid download errors.
Unwanted malware piggybacking on the installation No support website Doesn't work for Windows 8
The other reviews must not have been using Windows 8 as it wouldn't work for me. No support on their website and a crap load of unwanted malware that will end up on your computer through the installation if you aren't paying attention during it.