The LIVE version is only the Online version which you can access using any computer. You do not install it like the Desktop CD/Download program. You log into an Online account.
Did you use the Online version last year or the Desktop program installed on your dad's computer? Oh if there was a CD that was the Desktop program. You will need to find the data file ending.tax2019 to transfer into 2020 either into the Desktop program or the Online version. It should be in Documents in a Turbo Tax folder or search his computer for all files ending in .tax or .tax2019.
You don't need to install the 2019 program. You just need the .tax2019 file. And you can install the Desktop program on 5 computers. But you didn't buy the Desktop program.
Also if you use the Online version and you used Desktop last year you will notice several differences. If you used the Desktop program before you may not like the online version. It has less features and no Forms Mode. You can only do 1 return. Your return is only saved online so be sure to save both the .tax2020 data file and the pdf file to your computer when you are done. In case you need to amend in the future or if you need a copy to get a loan or something. You might not be able to access your online return when you need a copy.
