The 1.9.1 update cycle brought several graphical and functional upgrades to the core game that enhanced the DLC experience:
Introduces a suite of robotic parts—including hinges, rotors, pistons, and rotational servos—allowing players to build complex machines like folding-wing planes, cranes, and walking mechs. Kerbal Space Program 1.9.1 DLC
This DLC, updated to version 1.9.1 for this release, adds historical content inspired by real-world space missions. and walking mechs. This DLC
A powerful tool that lets players create, edit, and share their own custom missions with specific objectives, constraints, and unexpected events. Kerbal Space Program 1.9.1 DLC
Massive texture and shader improvements for Kerbin, making the home planet look significantly more detailed.