Cannot install Canon printer drivers after upgrade to Mountain Lion

Have got a MG3150 printer from Canon. which is in the supported list. I tried to add the new printer and get the message "can't install the software for the Canon MG3100 series becuase it is not currently available from the Software Update Server.

It says this, in spite of giving me a message that they are available when I attach the printer via USB. This does kick off an attempt to to seek printer updates.

So both methods of updating the printer drivers fails.

I tried trashing the Cannon software and the PPD file for the MG3150 followed by a downloaded reinstall, but no luck.

Any ideas, please?