Go here and follow the instructions.
https://www.lightvortexastronomy.com...s-du-ciel.html
I use Ascom with an eq5 USB cable from shoestring and Stellarium scope to interface with Stellarium from Ascom. Seems to work as does the PhD ascom mount connection to Heq5.
I have recently started using this and found that the latest Win7 updates and drivers were required to ensure some Ascom related USB connections worked.
Have not tried the Mac yet.