Here is a review of the driver situation and how to get it working, as finding the specific "KP206BUB" link is often difficult:
If you simply search "KP-206BUB driver link," you will be taken to ad-filled, unsafe driver repositories. Always get the driver from the seller who sold you the printer or use the generic CH340 + ESC/POS method. thermal receipt printer kp206bub driver link
Where to Get the Driver