Can't download Turbotax to my Mac after PC

I downloaded it successfully to my PC, but can't download now to my Mac. I have been able to do this for years and used to download it to 3 different computers before I retired. When I try to download to the Mac I get the message: "This license code has already been associated with an account. Please check that account and look for it in Downloads." The download I already have is for Windows not Mac. The disk I bought is for PC and Mac.  I was told on the 40 minute chat yesterday that I need a new license for each computer download. When I go to the Contact Us link to attempt getting the Mac download pushed to me, I get a phone number for the unhelpful robot voice.