Q: 10.9.2 - Wacom tablet not compatible.

Try updating the driver software on Wacom's website.

Some users complained the updated drivers didn't work for them, though.

The only way to know for sure Is to download and install Wacom's recent driver and preferences panel.

I use a Wacom Intuos 3 tablet with my iMac and the new drivers work fine for me with Mavericks.

I use the Wacom mouse, standard pen and the airbrush pen and everything seems to work fine.

http://us.wacom.com/en/support/drivers

I had the same problems after updating to OSX 10.9.2, my wacom thought that the pen was always in the top left of the screen. Updated driver, fixed problem! Thanks MichelPM

The Intuos Pro Driver 6.3.7-3  worked of me on OSX 10.9.2

"Install Wacom Tablet.pkg" can't be opened because it was not downloaded from the Mac App Store.

Your security preferences allow installation of only apps from the Mac App Store.

I need help please.

Apple has now changed the default settings to only download application from Mac App Store and identified developers. you need to change the settings

Please follow the steps given below to resolve this issue -

System Preferences > Security & Privacy > General > Allow applications downloaded from > Anywhere

Your security preferences allow installation of only apps from the Mac App Store and identified developers.