This is a link to the American drivers, but first, determine which model of Officejet 6500 you have (sometimes you see the numbers by where the ink goes).
Then after you select the right printer, it will ask for your operating system, so click here to help you find that information out.
After you go through that process, the scanner software to download is under Full Feature Software and Drivers. The information provided here is assuming that the software just was never installed and that you aren't getting any difficult error messages. If it is connected USB, you will want to unplug that until the installation asks for it again.
I really hope this helps you and best wishes to the husband to get to feeling better soon. I may not be able to continue to help tonight but I will try if you need more assistance. Denmarfl will be good help too.
Good luck!