You cannot open "Part 2" by itself. It is a middle link in a chain. You typically need Part 1, Part 2, Part 3, etc., all in the same folder.
Empyrion is frequently on sale for a very low price. Buying the official version ensures: Empyrion.Galactic.Survival.v1.9.3.part2.rar
When you right-click Part 1 and select "Extract," your software (like WinRAR or 7-Zip) automatically pulls data from Part 2 and the others to reconstruct the full game installer. 2. Version 1.9.3: The Context You cannot open "Part 2" by itself