"Unable to download the software from the server at this time error" when installing printer
Normally your Apple would automatically download the supported printer drivers with system software.

Run a Software update (Click on Apple icon top left) on you computer to get a update.

OR-->

Download the driver from here:

http://www.techspot.com/drivers/driver/file/information/16150/


  Apple delivers third-pary software for scanners and printers via
  Software Update. Simply connect the printer or scanner to the Mac. If
  software is needed and available, OS X will automatically download and
  install it.
  
  This article is a comprehensive list of currently supported printer
  and scanner models and associated software provided by third-party
  vendors as of 28 June 2012.
  
  Important: Run Software Update before connecting to a printer or
  scanner. This will update the Mac's database on the latest supported
  printer and scanner models.