VR Milling is for Denford machines. Conect had their own software, which was either BBC or DOS based.

Conquerer, who's boards were used in some Conect machines, still exist and do an upgrade kit - Conqueror Design & Engineering Ltd - CNC control cards, stepper motor drives, CAD/CAM, CNC software, EaziCNC
Although having just checked their site, the upgrade kit is out of stock, and it should be £150.

Personally, I'd look at upgrading the controller and stepper drivers as the original controller/drivers were pretty basic, and modern stepper drivers will give you better performance.