3. Reason CS - Mac OS Installation Permissions When opening the installer you will be prompted to allow it from the System Settings click Done and go to System Settings > Privacy and Security and scroll down Click Open Anyway Click Open Anyway Enter your password and you will be prompted to enter your password again so that the installer has the necessary permissions to install the files. Click on Quit Go to Applications folder and run the Reason CS.app It may ask for permissions, if it does not then close it and go to the desktop Close Reason if it is running. Click on the It will start the control surface app and Reason. When you quit Reason, it will automatically quite the control surface app, after a couple of seconds. Set the permissions on the Remote scripts folder: open a Terminal and copy/paste the following. It will ask for your password, enter it and hit enter. It should not produce any output. sudo chmod -R 777 ~/Library/Application\ Support/Propellerhead\ Software/Remote/ Continue with the installation guide.