Direct download link: http://tinyurl.com/ylmzz2h ;
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"For the most advanced users, TubeToolboxs Professional Tools let you do things such as gather users and videos from any page in YouTube(TM) and automatically send friend requests, messages, and comments to any gathered list. It also has tools that automatically accept your friend requests and automatically post bulletins. Furthermore, TubeToolbox completely complies with YouTubes terms of service."
Instructions: Install Tube Toolbox, run it, then close it. Copy Youtubelib.dll file in a folder where you installed the program and that's it.