Open the extracted folder and locate KSP2_x64.exe to begin your space program. Note on Early Access
This archive contains the third segment of the Early Access build. KSP 2 is the sequel to the acclaimed space flight simulator, redesigned from the ground up to introduce next-generation space exploration while maintaining the charming, physics-based chaos of the original. What’s Inside This Part Kerbal.Space.Program.2.Early.Access.part03.rar
Right-click on Part 01 using WinRAR or 7-Zip and select "Extract Here." The software will automatically pull data from part03 and all other segments to recreate the full game folder. Open the extracted folder and locate KSP2_x64