I'm playing career mode. I have 2 mini-stations at Mun and Minmus. But they contains parts from an add-on that did not have any technology tree entries and I added them as I felt right. Now there is semi-official mod to that add-on, that puts items in tech tree, so I no longer need a custom technology entries.
Problem is, if I'll upgrade, some parts will no longer be available to me, and I have them in ships on parking orbits.
Do I need to land these ships, or at least take crew hell out of them before I upgrade? Or is it safe to upgrade, and ships will stay intact?