rickfen wrote:Why would a download be "different" if they are all the same 1/2 hour or hour show.
Video files can have different frame rates and/or different cutting (take out advertising blocks of HDTV rips, for example). Resulting, you can have a whole bunch of video versions of the SAME show, but with completely different timings. That's why not all subtitles match all video files.
By using software as Oss pointed out, this matching is done automatically. Mind you, also then there can be mistakes and mismatches.
Another method is searching manually on the website, choosing subtitles which are stating to match your video file. Or first look for available subs, and then find the matching video file.