CrazyTalk 7 is a 32-bit program, whereas MacOS Catalina only supports 64-bit program.
https://en.wikipedia.org/wiki/MacOS_Catalina
You may purchase an upgrade to CrazyTalk 8 that will support 64-bit. You can contact our Sales Support by raising a new support ticket under "Purchase" question type.
https://www.reallusion.com/crazytalk/default.html