How do I download and install the printer software?
You can download software from two methods: Method 1 - Go to 123.hp.com/laserjet (Windows) or 123.hp.com (OS X) and click Download, then follow onscreen instructions. Method 2 - Go to www.hp.com/support/ljM255, select Software and Drivers, download the software for your model and OS, launch the file, and follow onscreen instructions. When prompted, select the appropriate connection type.
From the official HP Color Laserjet Pro M255 M256 Printer manual, page 8
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