Great!! I've just tried
RTMPexplorer with rtmpsuck and it works!!
But I think, is there a way to resume the video? (in case for any reason the process stops)
By the way, this method is about download or capture/save streams? (I'm asking for because I tought it was about capture/save, but then I've noticed I can also close the browser and the process still goes on!!!
Anyway it works, thanks Stream Recorder!!