Hi Ian
I have an EQ6pro and I have used Starry night pro and Carte de ciel to drive the eq6.
I settled for Carte de ciel as my Starry night laptop does not have a RS232 serial port and using a converter only gave me problems.
So i use an older laptop running win 98 and Carte de ciel with no problems.
You must install the Ascom drivers however and the eq6 will work with the Celestron 5i driver.
The nice thing is Carte de ciel is free.
Regards
Steve