→ Download the latest release of the Just Playout bundle which includes the most recent version of composition:builder.
Extract the ZIP archive.
Open the DMG and follow the shown instructions.
Optional: Install the → Template Package afterwards.
Upon completion of the installation procedure, composition:builder can be found in the Just Playout folder inside the Applications folder of your Mac. Copy the application on as many Mac's as you want and use it there to build new, and edit existing composition.
We do not recommend running composition:builder on a machine where just:out is installed. Please use a dedicated machine for graphic template creation.