Posted September 13, 2014
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Did that myself yesterday. Couldnt figure out how to get the DLC installed. Turned out I needed to exit steam, restart and verify the files.
It then downloaded them (about 1.7GB).
Make sure your friend also installs te unnoficial community patches - worth doing. :)
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Though Like i said - its worth adding those community patches (they're stickied on the community hub for Skyrim).
Edit: oh, page #1000
Also, he'll have to check the expansions under "Data Files" on the launcher. The same sticky about the community patches will tell him the best order.
Post edited September 13, 2014 by Sachys