Since the specific link for "KP206BUB" is likely broken or non-existent, follow these steps to get it running:
Since this printer often uses a generic USB-to-Serial interface, follow these steps if the installer doesn't automatically detect the port: Connect and Power On thermal receipt printer kp206bub driver link
Go to Windows Settings > Bluetooth & devices > Printers & scanners. Find the KP206BUB. Click "Manage" > "Set as default." Since the specific link for "KP206BUB" is likely