: You won't get official security patches or the latest content updates from the developers.
: This indicates the original large installer has been split into multiple smaller pieces (Parts 1, 2, 3, etc.) for easier uploading and downloading. You would need all parts to successfully extract the files.
If you're interested in the game, the safest way to play is through , where it’s frequently on sale and includes workshop support for thousands of community-made ships and planets.