The Download Now link directs you to the Windows Store, where you can continue the download process. You must have an active Microsoft account to download the application. This download may not be available in some countries.
From Ankit Corp:
TubeMate YouTube Downloader enables you to quickly access, search, share, watch and download YouTube videos. Now windows phone users to watch and download any MP4 videos you want. Because downloading always happens in the background, you can go on watching YouTube, surfing the Internet, tweeting, and listening to your music as you download. This app makes it easy to discover, play and download the MP4 movie you love on Windows Phone. Compared to other existed video downloders, it offers you free, unlimited and high-quality videos. You can download all the mp4 video songs. Features for TubeMate Videos HD: (1) Play & Download videos (2) Simple and easy to use interface (3) Inbuilt Video Player (4) Top Trending Videos List (5) Video File Download in your SD card (6) Offline play Downloaded video without internet (7) Free unlimited video downloading (8) Background Video Download Supported (9) Multiple download resolution options (10) search and related videos suggestions.