A few possibilities come to mind:

Overall, the Kobotoe Extended is a powerful and versatile input method editor that offers advanced features and functionalities for users who require precise control over their input methods.

: If the device isn't recognized, check if both the standard KoboTouch and KoboTouchExtended drivers are active; usually, only the Extended version should be enabled.

: Search for "KoboTouchExtended" and click install.