Hmm, looks like I should have done a bit more homework. One of my friends has the Dark Conspiracy stuff and he tells me that one of the 1st edition books "Protodimensions", actually has instructions in it for updating the rules to be compatible with Twilight 2.2
However he also said that the equipment and general skills use isn't locked into the rules-set and so it's easy to use 1st edition stuff with the Twilight 2.2 rules with very little conversion (and in some cases none) needed - especially as most of the equipment was just ported over from Twilight 2nd edition in the first place. the most obvious thing is that vehicles have a cruise speed instead of a travel speed but the main rulesbook already has a conversion guide in it to allow the use of Twilight vehicles with Dark Conspiracy and vice versa.
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