HT203491: OS X: Application icon has a prohibitory sign, or "PowerPC applications are no longer supported" appears
Learn about OS X: Application icon has a prohibitory sign, or "PowerPC applications are no longer supported" appears
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Dec 13, 2015 2:31 PM in response to Ranchorobertogatoby greg sahli,If the printer you mean is the HP Photosmart 8750, then it is still supported by the Photosmart 8700 Series driver. Shown here:
Printer and scanner software available for download for your Mac - Apple Support
You may need to delete and add the printer or, Reset the Printing System and then Add the printer, in order to get the latest driver to automatically be loaded.