The reason you can't install 2019 is because 2019 was the first year they started using the License Code to activate the program so it has to log into Turbo Tax. You can't activate it now. It will fail.
Some people at the end of this thread found how to bypass the activation for 2019
https://ttlc.intuit.com/community/taxes/discussion/re-there-was-an-error-with-validating-your-licens...
If you need to see the tax return and didn't save the pdf file, you could try the TaxPrinter service to convert a .tax file to pdf at
https://www.taxprinter.com
You may be able to install 2018 and prior since t hey didn't have a License Code but you will not be able to update the program or download any state programs you might need.
