I'm having a similar problem with MacOS. I'm running MacOS Big Sur 11.1 and now I can't open RTI Viewer at all. When I try, I get an error that says: "RTIViewer.app" cannot be opened because the developer cannot be verified. macOS cannot verify that this app is free from malware."
The manager now only gives me the option of moving the app to the trash or canceling my attempt to open it.
As a follow up, I did enough looking around that I know I can control-click to open the app, select open, then I get an option to open the application. I still thought I might report the problem here.