At some point, a month ago maybe, the trick was to NOT be signed into your RS-pro account, click on the link, and then sign in, and then it would let you download. That might be something to try. But, it never worked for me, even though it was working for mostly everyone else, so I did the turn off Greasemonkey & script thing, and copied and pasted the RS link into another window, and downloaded from there. so that is something else you could try.
Right now it works for me to start downloading it and then watch it the VLC way. I haven't ever figured out how to stream from RS.