For Windows 10, if you have installed the complete feature software for the HP printer, you need not be concerned. This is because HP Printer Assistant is installed on your device by itself, and you do not need to install the separate HP Printer Assistant downloading. To look for it, to locate it, you need to double-tap the HP printer icon on your desktop and then type in the model number associated with it. A new page will be opened to show HP Printer Assistant in the list of HP's accessories. The same procedure is applicable when your operating system is Windows 7 and Windows 8 on this page.
Unfortunately, the HP Printer Assistant download for Mac isn't available. It is not available in macOS as well as OS X. The full functionality that comes with the Mac driver is that it installs it with the HP utility. This is almost a tool and features similar to the HP Printer Assistant to solve the issue.