If you are having an issue downloading ESO on Xbox One, you can try the following troubleshooting steps:

Check Xbox Live Status

You can check the Xbox Live Service Status here. If there are outages reported, you might experience connection issues.

 

Check Internet Connection

Check your Xbox One’s internet connection by pressing the [Menu] button on your controller, selecting Settings, then selecting Network, selecting Network Settings, and finally selecting Test network connection.

 

Forward Ports

Forward the following outbound ports on your router to ensure a connection to the internet can get through:

• UDP Port 88
• UDP Ports 12000 through 32000
• UDP Port 6250
• UDP Port 5060
• UDP Port 5062
• UDP Port 3478 through 3479
• UDP and TCP Port 3074
• UDP and TCP Port 53
• TCP Port 80
• TCP Port 433

Contact Xbox Support

For further troubleshooting help regarding downloading issues on Xbox One, you should contact Xbox Support here.