Building a download queue to be executed asynchronously ?

The current download process our app uses works, however the UX isn't ideal.  It blocks the thread, so if the user changes states in the scene, the download will stop.  We cannot reasonably expect users to wait on the screen without altering it, until the download finishes.  
I'm trying to implement a download Queue that runs asynchronously instead.  I'm wondering if there are any scripts in the Unity library, or subsequently Oculus library, that would assist me?
Thanks in advance