VDownloader4 Plus will not start now

I am having numerious problem with my version of V Downloader4, the shortcut on decktop will not work nor am I unable to find the program in my programs. I have tried to download the program again but the link does not work. I bought the plus version but have only been able to use this once then it stopped worlking, I haved created exceptions in the Avira Anti-virus Pro, How do I remove the program. where is the official removal tool??