RE: The Four Horsemen of the Apocalypse 1921 Valentino version
Youtube single file in MP4 format, approximately 333 MB at standard quality:
http://www.youtube.com/watch?v=N7I_ltX6-ZY
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Archive.org has several video formats — Ogg, WMV, MPEG4, and the film is broken into 5 files:
https://archive.org/details/The_Four_Horsemen_of_the_Apocalypse
If you are familiar with torrents, the torrent allows you to choose which formats and which sections to download.
Thanks for the links!