Installing Sound Studio 4 and Security Preferences.
You may get a notification that Sound Studio "can't be opened because it is from an unidentified developer" if your security preferences restrict installation to App Store apps only. To fix this issue, go to your System Preferences > Security & Privacy. Click on the General tab and choose to allow apps downloaded from: App Store and identified developers.
To bypass this security alert when launching a version of Sound Studio for the first time, right-click on Sound Studio and choose Open. You will then get the security alert with an option to open the app.