Norton AntiVirus Crashes On Old WinXP Machine

I maintain (remotely) a very old WinXP PC for my elderly mother-in-law.  I've had NA running on it for years but recently ran into a problem with Norton crashing (see screen shot below).  I tried to run Autofix but it failed to fix 1 item. The current NA version is 21.7.0.11

I know this is not the latest version of NA, so I did a new version check and tried to install the latest version.  It couldn't be installed. When I ran the installer, a message popped up that said the processor didn't support SSE2, which is correct.  As I said, this is a very, very old PC with an AMD CPU.

Next I thought to run the Norton Remove and Reinstall Tool until I read that it will install "the latest version" which I already know won't install because of the old CPU.

So my questions are: how do I uninstall NA and reinstall the same version I currently have (21.7.0.11)?  Is there a direct link to older versions?