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Are you using an Apple Mac or Windows PC ?
You can download the Drivers and Software from here --> http://support.hp.com/us-en/drivers/selfservice/HP-Officejet-Pro-8600-e-All-in-One-Printer-series---N9/4322916/model/4323651
Download the HP Officejet Pro 8600 Plus/Premium e-All-in-One Printer series - N911a-n Full Feature Software and Driver
Let me know if you have any difficulty downloading it