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Just install as usual, make your own folder and name it whatever, I named mine HDR. Place your random video and just rename it as "raw" so now your .mov will be processed automatically, you can use the .avi save option or just edit the jpegs.
HDR (High Dynamic Range) is performed in camera by capturing two different ISO values. Most of these shots were at ISO 100-800 or 200-1,600. Those two streams are then split and re-fused back together in post production to produce the HDR video.
Magic Lantern is free for download and everything you need to produce HDR video is included and also free. Alex is truly a pioneer and he is offering the 5D Mark II build to those who donate. It will eventually be released (as this one is BETA) but you can get it early by donating.