You can tell I've turned a 360 on the first time in months with this flurry of questions can't you 
Trying to download the game addon content for Forza you get in the box. Entered the code, clicked download, cool. Went back out of the menu to play the game and it said 'Download paused.
Why didnt it keep downloading whilst I played? I've now spent 10 minutes hunting through the dashboard to find where I can make it resume downloading to no avail. It says I have no active downloads.
How can I make it download whilst I play? I've enabled background downloads but I think this only relates to when the console is powered off.

Trying to download the game addon content for Forza you get in the box. Entered the code, clicked download, cool. Went back out of the menu to play the game and it said 'Download paused.
Why didnt it keep downloading whilst I played? I've now spent 10 minutes hunting through the dashboard to find where I can make it resume downloading to no avail. It says I have no active downloads.
How can I make it download whilst I play? I've enabled background downloads but I think this only relates to when the console is powered off.