Sorry you can not install the 2021 program at all. You should try to get a refund for it or use another computer to install it on. Or you can use the Online web version. We can tell you how to transfer from 2020 on your computer into the Online version.
Start an Online return here,
https://turbotax.intuit.com/personal-taxes/online
If you used the Desktop program before you may notice several differences and 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.
