Hi GavinH-llm, my name is Felipe Lucas, Independent Advisor and Microsoft Windows user like you.
I'll be happy to help you.
I've found a link to download it on an HP Support community website:
https://h30434.www3.hp.com/t5/Printers-Archive-...
The article also offers an alternate option of installing your HP printer.
NOTE: Maybe if you click the download link, your browser may block it, because it's an .exe file. What I did to be able to download it was right-clicking and choosing "Save link as..."
After that the download will show on the browser's download bar but still blocked, so I clicked on the arrow icon on the right-corner of it and clicked "Keep file"
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.
Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.
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Felipe Lucas
Independent Advisor