@tksprabu
The 2020 should work, unless TTX software folks are messing with the code acceptance system.......though, I guess it may not work if you've already had 5 installs. I installed 2020 on a new desktop last week. Give TTX a call (Mon-Fri only) and see what they say...maybe they'll give you a new code.
What is the TurboTax phone number? (intuit.com)
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As for 2019, the code acceptance system for that year may be turned off since they don't support 2019 anymore. It was the first year with those installation codes. I couldn't install 2019 either, but then, I didn't expect to have it work. Earlier years may install OK, but you likely can't download any state software needed to open old files.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
