I am having the same problem and just received a reply from FOREXAPPLE.COM that is on the demo list of trading platforms. They suggested using their virtual server( See below his reply) I hope this helps
:
Hello Linda,
Unfortunately, I don't think that metatrader works with MAC OS however, there is a solution you can consider.
You can sign up with a VPS service where they run the platform and can install any EA or signal service to it. It is easy to access using your mac through your web browser.
If this is of interest to you check our ForexVPS
Hope this helps.
Thank you,
Forex Apple