While the server typically runs on Paper 1.12.2 , it uses specific plugins to allow Eaglercraft 1.8 clients to join.
Ensure "Hardware Acceleration" is turned ON in your browser settings to allow the game to use your GPU. Final Thoughts eaglercraft clients 1.8
Eaglercraft 1.8: Technical Evolution and the Modern Browser-Based Client Direct Answer While the server typically runs on Paper 1
You do not "install" Eaglercraft in the traditional sense. Here are the three methods. eaglercraft clients 1.8