Give the office a call and they will be able to give you an ID.
You probably have cherried version? Just create .txt file in your Skyrim catalog, call it "steam_appid" and put some numbers in it, 500 for example and that kinda should work.
App ID : A string that identifies one or more apps from a single team. An App ID consists of a bundle ID search string preceded by the Team ID, a 10-character string generated by Apple to uniquely identify a team.
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