I read all the replies to this question. But I would like to add and share more information I discovered by exploring the software. If you download two TurboTax software, you cannot use them at the same time. But once you are done with one software and you have already installed the second (have different names saved; add a 2 or b to distinguish), open the TurboTax software, on the top select the "Help" tab, go down to the "Switch product" option, and will indicate what is currently running for TurboTax software as an option listed there. You will click on "Activate new product" and follow the prompts. You will require your software license code (again). And that should switch your software to the second installation, you'll be able to use the next 5 federal e-files. I hope this helps someone; similar to my situation.
