From this link you can see that the hector_quadrotor is only available for indigo and kinetic so, I assume there are no melodic-compatible versions. On looking through the github issues, this has been brought up with people talking about building it from the source using catkin. if it is indeed the right way to install, how does this process work? Steps? How does this make it compatible to melodic?
PS - I am new to ROS and GAZEBO