The thing about "accounts" is confusing here. You say you downloaded Home and Business. That is desktop software, and you do not log on to an account online to use that software. After you download it, you just open the program on your own computer and use it by going to the top of your screen and clicking on File and then New Tax Return.
So I cannot figure out what you are trying to do when you say you want to combine accounts.
You say you "updated" your computer--do you mean you updated the operating system? It looks like you are using OS10.12.6, which works for 2018 TurboTax. I am wondering if you are having some sort of glitch because you are trying to use the software for 2016.
If you need to download the programs again, you can do that:
https://ttlc.intuit.com/questions/1901289-how-do-i-download-the-software-i-purchased-at-turbotax-com
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
