hello i am trying to use optseq2 to design a study. I have a new mac book pro with El Capitan installed. I have tried downloading all different optseq2 versions but each time when i try to run it through the terminal i get the same exact error:

-bash: optseq2: command not found

what am i doing wrong here? which version should i use and how do i get it to work? thanks so much

Yoed