Main files
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The Masterfile and update plugin packaged together. Make sure both the .esm and .esp files, and their respective .bsa's, are extracted to your Data folder. READ DESCRIPTION BEFORE UPGRADING FROM VERSION 3.1 OR EARLIER.
Optional files
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Dawnguard users now have a ship location near Castle Volkihar, new plants and ingredients onboard, and one of two new crew members who can act as followers