First post and already a problem Also, sorry for my bad english, not my native tongue. Ok, I downloaded the very latest MechJeb from here: http://jenkins.mumech.com/job/MechJeb2/84/ Extracted the files to my GameData folder so the Directory Structure in GameData looks like this: /Squad /MechJeb2 Changed the part.cfg to this: TechRequired = start entryCost = 0 (I also tried it with TechRequired = basicRocketry, but same effect ->) Now when I start KSP, goto RND, I can then research the MechJeb AR202 in the start node. If I go and build a rocket then it tells me below the AR202: "part model requires an entry purchase". I can't click / place the damn thing . I don't get it. When I go back to RND then (after I was in the rocket building screen) I can research the AR202 again, but nothing ever changes.