The engines are not showing up for me, If i load the craft file it says locked or invalid parts but it still loads and the engines are there? Any suggestions? Edit: the only engine that shows for me is the lander lift engine. version 5.5 with KIS and RPM installed. Edit2:Is there a different tech tree to use with this I don't have experimentalRocketry so I moved the endurance engines to veryHeavyRocketry and now it shows.