Because this is older software, you may need to go to System Settings > Privacy & Security and select "Open Anyway" if macOS blocks the app as being from an unidentified developer.
Drag the MotionArtist icon into your Applications folder. Smith Micro MotionArtist 1.3 for Mac Free Download
Smith Micro provides the final installer for users with a valid license key through their support portal. Because this is older software, you may need