With the online program, you pay at the end during the filing process. So, you can actually complete your entire return and then instead of filing and paying online, follow the steps below and you will transfer your .tax file (its the same file that gets created on your computer when you use the desktop) from online to desktop and use the desktop program to open it up. Then, you can finish filing on the desktop.
If you want, you can also call phone support and ask for a download of the MAC program. They will probably ask for some information about your CD and then issue you a download to use. I have included contact information for support below also. But, I don't know what the phone wait times are like and if you want to call.
