iTunes Extras on films missing.
Since redownloading my purchased films from iTunes onto my new laptop, I've noticed that all but one are missing the option to play iTunes Extras, I'm 80% sure I asked for them to be downloaded, but now under the category on the 'Purchased' page on iTunes called 'Not on this computer' it's blank. Any suggestions on how I can retrieve what's missing?
Also is there a way to automatically play iTunes Extras on film when selecting a film to play?
Thanks.