YOu Tube HD downloader

Today (05/25) when I tried to update my You Tube downloader, I always get the warning that it is unsafe, even though it is from the You Tube home page. Even If I click "Run Anyway, it won't download/install.

I've had the downloader on my computer for years and everytime I open it, it says to update to new version.

Any ideas why I keep being denied by NIS?

(How do I include snip?)

Thanks bjm. Appreciate the help.

https://safeweb.norton.com/report/show?url=youtubedownloaderhd.com

http://s13.postimg.org/m4nntk1if/screenshot.png

https://www.symantec.com/security_response/attacksignatures/detail.jsp?asid=23928