How do i prepare multiple returns for family members?

If you are planning to prepare more than one return, you would want to purchase TurboTax CD/Download as you get 5 free federal e-files with it.  You can transfer your information from TurboTax Online to TurboTax CD/Download by following the instructions listed in the following TurboTax FAQ:

https://ttlc.intuit.com/replies/3302260

If you decide purchase TurboTax CD/Download you can do so by visiting the following link: https://turbotax.intuit.com/personal-taxes/cd-download/

If I buy Deluxe download will I be able to use it on different computers for different returns, incl. different OS - Mac and Windows?

I have the Mobile version Turbo Tax app on an iPad Pro and am also somewhat confused as to how (or if) I can prepare more than one tax rerurn with it. I had expected the app version of the software to perform as the program had in prior years however I do not think it will. 

In the past I had downloaded the desktop version to a 2010 MacBook Pro running Mac OS High Sierra version 10.13.6  This 2010 Mac, unfortunatey, will not support an upgrade to version 10.14 which is required to run the 2020 Turbo Tax software. To bad, as I was quite happy with the download version of TurboTax but am not feeing the same about the Mobie version. I called the support line for Turbo Tax and they were unsure if I could make the Mobile version work for more than one family member's taxes but are checking into it and are to call me back. 

Are others out there having the same issues? If you are using the Mobile version how do you like it?