The driver Julian wants to use is a 2019 update of all existing drivers, it fixes bugs in those earlier versions, and is available from ASCOM in the Drivers section.
ASCOM recommend to use this one for LX200 Classic, LX200GPS, ETX, LS etc.
Seeing this window probably means that he has a good connection to the mount.
He's using a newer release than the one I'm using, I don't think mine has this interface, but I'll take a stab at the settings.
COM Port: Enter the COM Port number the RS232 cable is using in Windows Device Manager
Guide Rate: Shows the rate selected in the mount.
Precision: See page 30 of the Meade Manual ?
Guiding Style: I'd guess Auto, North only, South only, and Off are available, like the PHD2 settings ?
Focuser Backlash steps: a setting like Dec Backlash - but for the focuser reversing direction ?
Reverse direction: Reverses the focuser movement direction of the buttons ?
Dynamic Breaking (Braking?): smooths the focuser movement ?
Colin Dawson the driver author would know better than me !
Michael
Wiltshire UK