System Creator - Copy other's systems?

I played in a game with someone who created their own custom system. If I wanted to use this system myself, how could I download it for my own personal use?

There used to be a thing, where if the last system you loaded for instance in a game with another player, would be the system loaded when you click new system in system editor.

Suspect this may no longer be the case.

However, find PAMM, the mod manager in the mod subforum. Use that to search neat mods, one of them is "system sharing". You can find a database of systems there, and can submit your own as well.

Thank you

I'm hoping for a button to save system at the victory/end game screen

That'd be great.

Check out the shared systems mod.