This one took me MONTHS to finally get through, since the music keeps me so on-edge and the file system took more frantic, random sifting from me than intentional name searches (my current scroll wheel is broken, so it took more effort to look through all the documents than necessary). I finally got into the flow of it and managed to finish it in less than 3 hours.
Unfortunately, every reasonable camera combination I tried was either "several" or "few" errors. Even after looking up a successful YouTube playthrough where ONE of the combinations I used was correct -- it still says a "few" errors! I'm not sure if it's the difference between browser and download versions.