Have you tried installing manually by executing the /exe file? The file name would be similar to w_turbotax_1040_hab_2020.080.0100.exe and will be in your download folder. Right click on the file name and select run as administrator. See if that helps. If not, then delete the file a try downloading it again.
Answers are correct to the best of my ability but do not constitute legal or tax advice.
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