Usually when the PDF download is not shown for a prior tax year it indicates that the tax return for that year was not completed or filed.
However, since the 2023 online editions have shut down it may also be that TurboTax has not updated prior year online information during the transition to the 2024 online editions which are due to be available in early December.
You will have to contact TurboTax support for assistance with this problem.
See this TurboTax support FAQ for contacting support - https://ttlc.intuit.com/turbotax-support/en-us/help-article/account-management/turbotax-phone-number...
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax
