I managed to download 2020 version, but when I install it, it seems to be there, but now won't open up -  goes through the install stage and when I go to open it, if shows me the TurboTAx 2020 block but it is blank and does not progress?  I need to access an older .tt20 file and software only on old computer I no longer own?

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No you can't. That link doesn't take you to a download option. 

@gary1954 That post was from 2019. Please use the current link here: Where can I download the CD/download edition of TurboTax?