Transfer Ghost directory to new local install

My linux partition stopped working. I managed to keep my ghost install directory on hand… but that’s a linux install of an old version of Ghost.

I have a new version of Ghost installed and running locally on my Windows partition. Is there a clean, easy way to migrate my old directory’s content and photos and stuff to the new directory, which actually runs?

As additional info: If I try “ghost start” in my old directory, I get an error: “Invalid Version: null”.