If cost is the main concern, you can legally obtain KSP for very little:
: Official versions allow for easy integration of Making History and Breaking Ground expansions. 🛠️ Version 1.12.3 Highlights Kerbal Space Program Free Download v1.12.3.03173r2
: Unofficial versions frequently crash or miss textures. If cost is the main concern, you can
: Includes the final hidden secrets added by the dev team. If cost is the main concern