There are a couple different ways you can open your Sunday Keys concert template inside MainStage.
- Open your Sunday Keys concert folder in your MainStage folder. You should have dragged this Sunday Keys concert folder and Patch Builder folder inside the MainStage folder when you followed the steps in the installer. It needs to be in your MainStage folder so you can view Patch Builder and all patches inside "User Patches" in MainStage. Double click on the concert to open it inside MainStage.
- Open any MainStage stock concert. Select File > Open and it will prompt you to close the current concert, and you can select yes, and then it will allow you to select a new concert inside Mac's Finder, and you'll select Sunday Keys and it will open inside MainStage.
After opening, even if you've used MainStage before, head right over to the Sunday Keys Resource Page and watch the installation and tutorial videos. They are extremely important! They will help you set up your gear, download the required sounds, and get you started quickly with Sunday Keys.