I believe I have found a fix for the common missing downloadable content kh_dayztaviana when you are trying to run a dayz epoch taviana 2.0 server. This may come as a stunner and I am not 100% if this is the solution but it does get rid of the error and does not seem to have any negative impact on the servers.
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[FIX] Dayz Taviana and Epoch missing kh_dayztaviana content
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[FIX] Dayz Taviana and Epoch missing kh_dayztaviana content
