I recently was sent a link to a movie file in someone’s dropbox via email. No matter what I did I couldn’t get it to download. Safari wanted to play it. To download the movie I needed to click in the safari address bar, paste the link, and then press option-return which downloaded the movie instead of playing it.
I’ve removed this entry as it’s against the youtube terms and conditions to download any video from youtube even if the author of the video says you can.
So if you want to share a video put it on Vimeo, not youtube.
To download from other sites check out this site:
or try this app: