If you go to the HP support site

https://support.hp.com/us-en/drivers/desktops

And enter the serial number of your retired HP device, it will respond with an error message saying that your product is retired and that they don't provide drivers and manuals any more.

HP policy for products no longer supported HP Support may vary by product. Once a product is retired, the official HP support content (troubleshooting articles, user guides, how-to videos, etc.) for that product is removed from the HP web site. Additional support content may still be available via the HP Forums or from third-party web sites; however, HP takes no responsibility for content authored by third-parties.