... or: what can go wrong will go wrong.   Again and again I read questions in "Technical Support" where people have lost save games or their complete installation, for various reasons. Personally, I had such a "hiccup" only once (corrupt save game) but could resolve it within minutes. No magic involved, I just follow a few basic guidelines:   Copy your KSP installation to another folder outside of the Steam directory, outside of program files and program files (x86),