The Headphones web-ui has buttons for retrying a download and choosing a different release. I find myself often using these, but unfortunately NZB360 does not have them. I'd would therefore like to request this.
Found this in api doc's: queueAlbum&id=$albumid[&new=True&lossless=True] (Mark an album as wanted and start the searcher. Optional paramters: 'new' looks for new versions, 'lossless' looks only for lossless versions)
But I don't know if this is just for searching or for downloading. Anyways, a 'retry' and 'new' button would greatly be appreciated.
I also captured the request headers for you: http://pastebin.com/kDA7VZDZ