Can't get Cubase 8.5.20 to come up on my System 5

Hi,

I’m trying to get Cubase 8.5.20 on my Mac running Yosemite to come up on my System 5 console with Eucon 3.3.2 and I’m not having any luck. Both Logic and Pro Tools show up on the console as they should but not Cubase. Any help would be much appreciated.

Thanks