Issue im working on with the game stuff in the second week.

Everything involving gamemaker studio 2.5 and the extentions used to un the Sonic Worlds engine seem to be functioning fine with one notable exception. As of time of writing, I cannot find the seperate “Bouton CS” extention that will allow me to continue into the actuall game design. Anyone here know how to fix this? Its the only think keeping me from moving on to the next step.