"Convert It" App does not work. OS 11.6.

Chimp Studios's web link will redirect you to several different sites, and they appear to be very questionable. I would remove

"Convert It" and use a different tool for currency conversion. That might be the Spotlight 🔍 menu bar item, or Apple's Calculator which can convert between different currency.

Or Apple's Caculator app:

No application named "Convert It" is installed by Apple in the Big Sur operating system. That means it was installed by someone else, either at the retail point of sale, or someone with access to your Mac, or it is part of a third-party application installation.

When you single-click the app "Convert It" and then press the option+cmd+i keys, what is the name in the copyright field?

It is the responsibility of third-party developers to provide compatible, functional software for macOS operating systems. You may need a newer version of the software if the developer has it to offer, and provided that they continue to support macOS Big Sur (11.6.1).

You are welcome.