There's nothing "special" about KAX, I just use the latest Firespitter.   Ignore the Firespitter folder on the distribution file (ignore the ModuleManager too, never install more than one in GameData, and never use an older version!), download and install the https://github.com/snjo/Firespitter/releaseslatest FireSpitter and it should work fine - it did on my rig (on KSP 1.12.2) at least. (this is one of the reasons I don't think distributing dependencies on the same file is a good thi
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