How to use TurboTax on a Mac

Hello,  I recently purchased a MAC.  I had previously purchased the TurboTax Standard product with CD and download option.  I seem to be having difficulty figuring out how to get this going on my new computer.  I expect there is a way to get the 8 return limit on a MAC?  It referenced using an online version but that looks like it charges you for each individual return you submit.  I do 6 returns typically.  Can you tell me how to do this?