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The launcher will not be able to verify your ownership while offline, and will subesquently leave it up to the game to determine if you can play with the DLC in question - The default setting sent to the game is to turn all DLC on. Typically, if you have started the game while online once you will be able to play with your DLC offline after that. At some point, the "validation grace period" will end and you'll have to go online again for validation purposes, after which you can revert to offline mode again.
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