Another Installation is in progress

I need help, I keep on trying to install Fortnite, but it says that another installation is in progress, even though I see nothing installing, how do I fix this?

Hello, thank you for reporting your issues with Fortnite. However, Answerhub is meant for issues relating directly to Unreal Engine 4 rather than our game titles. For assistance with Fortnite, please visit the following link:

http://fortnitehelp.epicgames.com/

If you cannot find the solution to the problem you’re encountering, please use the Email Us link on that page to contact Player Support for further assistance.