For those like me who use a Mac as their main computer, the newest OS, "Catalina" or 10.15, only supports 64-bit applications.
The map update app from Volvo hasn't been updated to that standard yet, and I have no idea when it will be. So no way to download the newest maps to a thumb drive.
My solution was this:
I already had Parallels running on my Mac with a virtual machine running Windows, because of a few old Windows apps I use for other reasons. What I did was before installing the new Mac OS, I created another VM in Parallels with the last Mac OS (10.14) on it. Then I just dragged the Sensus update apps over to the application folder in the VM.
I just tried it out to download the new maps onto a USB drive and it worked just fine, as expected. A bit slower than normal, but very workable.
Here's hoping this little tip helps someone else.