Question about Audible Romance Package

Are the books in the Audible Romance Package downloadable to a device, or streaming only?

I've been looking at the info at Audible, and they don't seem to say; they have instructions for adding titles to one's library on a device, but nary a word that I can find about downloading to a device.

If it's streaming only, I don't want to bother; if I can download, I figure I'll try the free first month to listen to a few titles. Thanks.