Bontempi provides driver packages on their official support site. Most legacy drivers were designed for Windows XP, Vista, and 7, but may work on newer systems using . Official Support Page: Bontempi Drivers & Support Common Setup File: BontempiKeyboardSetup.exe
Your Bontempi Keyboard USB Driver is working (MIDI data is being sent), but you haven’t set up a virtual instrument. Bontempi Keyboard Usb Driver
You have plugged in your keyboard, but your computer doesn’t recognize it. Here is the official troubleshooting tree. Bontempi provides driver packages on their official support