There are a lot of 32bit apps stil in use out there. Here's a quote from an article in Time magazine this week about how to check to see what 32bit apps you have on your system:
"... if you’re dependent on a particular 32-bit app, it won’t work in macOS Catalina, as many Twitter users discovered after upgrading. Meanwhile, some popular apps, like Adobe Photoshop, appear to be suffering from temporary compatibility issues with Catalina, so it’s best to hold off on upgrading until a software patch resolves those problems.
Want to see which of your apps are still 32-bit? On your Mac, hit the Apple menu, select About This Mac, and click System Report. In System Report, scroll down to Legacy Software, and take a look at all your 32-bit apps."
Here's the full article: https://time.com/5696302/macos-catalina-upgrade/
I know this doesn't resolve the problem if RTI software no longer running - but I did want to point out that folks might want to be cautious about upgrading until they see the full impact - not just RTI software.