It will be automatically mounted by Mac OS X, which means being made accessible in a new window. Installation from DVD: Insert the DVD.Using the Steinberg Application Installer Tool Using the Steinberg Application Installer Tool is entirely at your own risk, Steinberg cannot be held responsible for any consequences that arise from this. Please be aware that running incompatible Steinberg software on Yosemite, El Capitan or Sierra may cause issues. It doesn't make any programs officially compatible with them. Pay close attention to the fact that the only purpose of this tool is to allow the installation on those operating systems. If you already have installed the software on a previous Mac OS X version and you've updated to Yosemite, El Capitan or Sierra afterwards, you don't need the Steinberg Application Installer Tool. The tool is only required for new installations of the programs listed below on Yosemite, El Capitan or Sierra. It might be possible to use the tool successfully with later macOS versions. The Steinberg Application Installer Tool is a software tool that allows for the installation of compatible as well as incompatible Steinberg software on Mac OS X 10.10 (Yosemite), 10.11 (El Capitan) and macOS 10.12 (Sierra). Steinberg Application Installer Tool for Mac OS X