The HP OfficeJet 8720 printer driver can be downloaded in many ways. Select any one method to download the printer driver like driver installation with CD, using the downloaded setup file from 123.hp.com/ojpro8720 or in a manual way. Follow the below given procedure to download and install the printer driver.
The operating system compatible are given below. Check before downloading the printer driver.
Windows XP 32-bit, Windows XP 64-bit, Windows Vista 32-bit, Windows Vista 64-bit, Windows 7 32-bit, Windows 7 64-bit, Windows 8 32-bit, Windows 8 64-bit, Windows 8.1 32-bit, Windows 8.1 64-bit, Windows 10 32-bit, Windows 10 64-bit
Macintosh OS X (v10.5), Mac OS X (v10.6.x), Mac OS X (v10.7.x), Mac OS X (v10.8.x), Mac OS X (v10.9.x), Mac OS X (v10.10.x), Mac OS X (v10.11.x), Mac OS X (v10.12.x)

1. Driver installation using the CD
2. Driver installation using setup file
3. Driver installation in a manual way
You need a computer with CD/DVD drive, installation CD that comes along with your printer and the USB cable to connect with OfficeJet Pro 8720 printer .
Turn on the computer to install the HP OfficeJet 8720 driver. You should not connect the USB cable until you are prompted to connect the cable.
Insert the CD/DVD into your computer and make sure that you execute the setup file in the CD. The installation wizard will be started. Follow the instruction that appear on the screen. You will be prompted to connect the USB cable.
Connect the USB cable and the printer will be detected. Proceed with next step. Complete the installation wizard by entering the necessary details and finish the printer setup successfully.
You have to download the most current version of your driver from the HP website. Visit the site 123.hp.com/ojpro8720 to download the necessary driver. You need a USB cable and an active internet connection.
Turn on the computer to install the HP OfficeJet Pro 8720 basic printer driver. Do not connect the USB Cable until you are prompted.
Visit the support.hp.com and enter your printer model number. You will be directed to the product home page. In the left side of the page, click on the software and driver tab to go to the download page. The download page will have two types of driver download. You can either download the full feature software driver or only the basic printer driver.
Download the basic printer driver from the 123.hp.com/ojpro8720 website and setup file as administrator. The installation wizard will start and follow the instruction to complete the setup. Connect the USB cable when you are prompted. Enter the model number and finish the setup
Use the “Add a Printer” option in Windows to install the HP OfficeJet Pro 8720 printer driver in a manual way.
You need the printer application and setup file of OfficeJet Pro 8720 printer from the site support.hp.com . check whether your system is compatible for the download. You also need the USB cable to connect with the printer.
Turn on the computer to install the OfficeJet Pro 8720 printer. Connect the USB Cable between the computer and printer. You need to extract the application zip files to a file location. Type “printer” after clicking on the start button. The printer option “Add a printer” will appear. Click on it and complete the installation wizard by entering the necessary details to configure the HP OfficeJet Pro 8720 printer.