I have a new PC and want to move my Raft saved game. Just copy/paste doesn't seem to work. I'm not using any digital platform or service.
The saved games location for that early version is in
Copy/pasting should work, according to multiple comments I've seen (most were about the Steam version, but at least one wasn't). Make sure you have the same game version on both PCs, and make sure you have the exact folder structure on both ends.