If the motor’s actual velocity deviates from the commanded value by more than a configurable threshold (default 20%) for 500 ms, the driver:

Choose "Browse my computer for drivers" and point to the folder where you extracted your download.

If you have lost your original driver CD and cannot find a reliable download, your best recourse is to join a CNC community forum where veteran members have archived these now-rare files. Alternatively, see the driver failure as an opportunity to upgrade to a modern Ethernet controller that offers faster speeds, greater stability, and native Windows 11 support.