To install the HP OfficeJet Pro 8720 printer, start by unboxing the printer and removing all packing materials. Connect it to a power source and turn it on. Follow the on-screen prompts to select your language and region. Install the ink cartridges and load paper into the tray. Next, visit 123.hp.com/setup officejet pro 8720 to download and install the latest printer drivers. Follow the setup wizard to connect the printer to Wi-Fi or via USB. Once installed, complete a test print to ensure proper functionality. Your HP OfficeJet Pro 8720 is now ready for seamless printing.