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I am working with an school trying to load print drivers on iBooks running OS 10.6 and 10.7. I loaded the latest drivers for the printers but found that they did not work correctly. I went to the Library and removed all the drivers and PPD's. When I tried to load the earlier version of the driver I get the message "A newer version of this driver already exist on this computer" and it will not let me load the driver.

I tried the same procedure on my personal MacBook Pro 10.8 and I can load and unload the drivers with no problem.

Any clues as to why this is happening?

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Your first problem comes from the fact that iBooks have G3 or G4 PPC processors, and Mac OS X 10.6 and 10.7 are Intel only. Any chance either the hardware or the software is something other than what you specified? – Daniel Sep 28 '12 at 0:42

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