I have a similar but different issue. I have done a clean install of DCS World 1.2.4, BS1, then BS2 upgrade. Activation kept failing on BS2 so I figured I messed something up, uninstalled and re-installed, this time picking the "Upgrade from BS1 internationa key" (or similar) selection. All went fine, went to DCS World Multiplayer where it was asking for the Seriel # to activate and all it asked for this time was the UH1 and Mustang, which I don't have (A10, FC3, and Combined Arms are already activated). I figured it was auto-activated during the install. Go to Module Manager and Black Shark says "No Key"... what now? Oh, and BS2 works fine.