Mac devices have a much wider range of operating system versions. It is important that you select the correct version of Citrix for your version of Mac OS/OSX. To find your Mac’s version, click on the “Apple” menu in the top left-hand corner of your Mac (this will be all the way on the left of the top bar). Select “About This Mac”. Your MacOS/OSX version will be shown, along with it’s more common name. Find it below and use the link to reach the correct installer.