Error Message, Rhino Evaluation + grasshopper

Hi, 

I am a student wanting to use Rhino and Grasshopper from a Mac. I've downloaded Rhino 5 onto my mac, Rhino 4 evaluation version (is there a version 5 for pc?), and grasshopper plugin and have received the following error message when typing grasshopper into the command line. I am using parallels, and trying to do this through the evaluation version. 

I am not usually very good with windows and therefore am unsure as to what the error message means. 

Can anyone tell me what i have done wrong? Is there a way to use the mac version, save the file, then use it in the evaluation version?

thanks