Some Mac systems do not open the ACI Flex ordering software when using Safari. Some Mac systems will store the download into your downloads section of the browser, or in your download folder. The file you would need to launch is called launch.jnlp. If you see this file in your downloads folder, but it has a number after it (launch-4.jnlp for instance), it is the same thing. The number is just indicating how many times you have tried to download the file. Double click on this file in your downloads, it will open the ordering software.
If you are unable to launch using safari, please try to launch the software using Firefox, or Google Chrome. (If you do not currently have an alternate browser installed, please click on the name to navigate to its respective download site.) When using either of these browsers, your software should launch after clicking on the ACI Flex icon without having to navigate to a different area to download.