How do I install the HP DeskJet GT 5810 printer software?
Insert the HP printer software CD into your computer or visit 123.hp.com/dj5810 to install the HP printer software. For Windows, if the installation program does not start automatically, browse to Computer, double-click the CD/DVD drive icon with the HP logo, and then double-click setup.exe. For Mac, the HP printer software is only available at 123.hp.com/dj5810, as the CD will redirect you to the web.
From the official HP Deskjet GT 5810 All-in-One Printer manual, page 7
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