Fortnite wont open, and now wont download, why?

Hi, I hope you're doing great out there. I am an Independent advisor and I am here to help you in regard to your concern.

Do you have an external hard drive plugged into your console? If yes, please unplug the hard drive and then perform a power cycle before attempting to install the game again, keep the hard drive unplugged.

​​​

“POWERCYCLE CONSOLE​​​

​​​

1. Turn off your console by holding the Xbox button on the front of the console for approximately 10 seconds. The console will turn off. ​​​

2. Turn your console back on by pressing the Xbox button on the console or the Xbox button on your controller. ​​“

If you don't have an external hard drive we may need to reset the console keeping your games and apps. Don't worry because as long as you're connected to Xbox Live your saved progress, games, will not be deleted. It will remove all of your accounts but you can add all of them later on.

“Press the Xbox button to open the guide.

Select Profile & system > Settings > System > Console info.

Select Reset console.

Reset and keep my games & apps.”

Hello all,

Currently this is our Service Status:

• 
  
  
  Limited
  
  Purchase and Content Usage
  
  
  ‎11‎/‎6‎/‎2018‎ ‎7‎:‎29‎:‎23‎ ‎PM
  
  Buying items, redeeming codes, or downloading purchases
  
  Affected platforms:
  
  
  
  Xbox One
  
  
  
  Xbox 360
  
  Affected services:
  
  • Downloading items that you have already purchased
    
  
  Latest update:
  
  We are aware that some members may be having problems finding previously-purchased content or purchasing new content. We are working to resolve the issue as quickly as possible, and we will be sure to provide you with
  frequent updates.
  

Same here it said go to xbox support

I would select home button and select the quit and press the button to restart your game app

Also try and power cycle between the uninstall and reinstall of the game.