Kerbal.space.program.2.early.access.part01.rar

: Use a program like WinRAR or 7-Zip . You only need to right-click the first file ( part01.rar ) and select "Extract Here" . The software will automatically find the other parts and stitch them back together into the full game folder.

The file is the first segment of a multi-part compressed archive. Kerbal.Space.Program.2.Early.Access.part01.rar

: You must have every single numbered part (part01, part02, part03, etc.) in the same folder. If even one "piece" is missing, the archive cannot be opened. : Use a program like WinRAR or 7-Zip

What are you seeing (e.g., "Unexpected end of archive")? Do you have an extraction tool like 7-Zip installed? Kerbal.Space.Program.2.Early.Access.part01.rar