I just tried the new version, and it seemed to work once, but now I can't get it to work anymore. It doesn't change the file.
In regards to the Apple downloader, it just downloads all the trailers from Apples site, nothing about just the ones you have in your library. And it seems that it is broken as of recently, cause I also only gets .mov files that are around 25-40kb. Maybe Apple changed something on their site.