Then you might be interested in the Rhino 4 Mac WIP as well:
http://wiki.mcneel.com/rhino/mac/wip
I use the WIP Version a long time 
about three or four Years maybe longer I don’t remember. Our tutor from university show it to us - beside the win Version.
And I also use it after the commercial Version.
I am really happy with the development of the Rhino Mac version. The next big thing i hope to (after Layouts) is the RDK and Penguin for beautiful technical Illustrations 
best regards Pascal
Hi Rodri…
I have a similar problems like Marco…
I entered in the Rhino forum but I do not see categories Serengeti?
Who can connect me with this categories?
Rhino 5 I am registered on your website (We have School License) with the same e-mail address…
Can I do something else?
Greetings,
PRAU
Hey Peter, drop me an e-mail with your licence key at tech.eu@mcneel.com , I’ll look into it !