Wacom provides legacy drivers specifically for Bamboo models like the CTE-660. Do not download drivers from third-party "driver download" sites; they often contain malware.
For Mac users searching for a Wacom Bamboo CTE 660 driver download, the news is grim. Wacom Bamboo Cte 660 Driver Download
Linux users have excellent support via the wacom kernel driver (no download needed from Wacom). For older distros, install xf86-input-wacom or input-wacom from your package manager. Wacom provides legacy drivers specifically for Bamboo models
Driver: PenTablet_5.3.5-3.exe (or similar 5.3.x version) Wacom Bamboo Cte 660 Driver Download