No longer can download

I have purchased this game a couple months ago, I think is was August of 2015. The app downloaded and I started playing with no problems, last month I needed to delete the app for reasons. Now (October 14th 2015), each time I attempt to download the app, it gives me this: The server gave an error during download: 401 Unauthorized. Is there a problem with the download server? Or is it my system?

leifur6868 about Call of Duty® 4: Modern Warfare™, v1.7.2