I don't think you can upgrade the Mac Desktop program. You can in Windows. You might have to call in. But why do you want to? All the Desktop programs have the same forms. You just get more help and guidance in the higher versions.
Contact Customer Service
(You need to pick the CD/Download program in the product drop down box.)
5am-5pm Pacific Time Monday -Friday
https://support.turbotax.intuit.com/contact/
What is the Turbo Tax phone number
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
