If you have an incomplete name or number, the site will suggest several possible models with photographs to help you identify your model. HP's support site (link in Resources) can direct you to the software replacement page for your printer if you enter the printer model name and number in the search bar. If you have more than one HP printer connected to the computer, remove all but the one you wish to identify. This process works best if the printer is directly connected to the computer. If you download, install and run this software from the HP site, it will tell you the printer's model name. HP offers a software download (link in Resources) that can identify all HP products connected to the computer. Typically, the printer will have the model name on the front of the unit, but you can also check the printer cartridges for the number.
Different printer models use different software and drivers, so it's necessary to identify the printer model to find the correlating replacement software.