I'm not convinced that an upgrade alone will solve your problem, because Amazon worked just fine for me in High Sierra, and the fact that it doesn't work on your husband's iMac suggests that there's more than OS version in play here.
Please notice that I hedged my bet on Catalina
Originally Posted By: joemikeb
Amazon works for me in Catalina so there is every reason to believe it would work for you also, but there are no absolute guarantees, because the issue may be something installed on your computer and external to the MacOS or browser.
Also remember this about my scouting. It is based on my experience with beta releases (I am currently running MacOS 10.15.5, iOS 13.4.5, and iPadOS 13.4.5) and Apple has been know to remove features in the release version that were present in the beta or to drop in a last minute security patch that wasn't in the beta. So while I am out there in front, like the Commanche my then 18 year old great great grandfather scouted in the Republic of Texas, Apple can be tricky to scout.
If we knew what it was we were doing, it wouldn't be called research, would it?
