What?  What does that have to do with Turbo Tax?

What file did you download?  Was it a .tax or .pdf or .txt file?  If it downloads as a .txt file, try changing the .txt to .pdf or use a different browser to download it.  It doesn't like Microsoft Edge so use something else like Chrome or Firefox.

How to get a copy after filing

https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-get-a-copy-of-a-return-i-filed-thi...

The bulk of my tax information was downloaded, but turbo taxes questions and mislabeled documents had me believing I had to ALSO download a CSV file along with what was received by Turbo Tax.  The CSV file is a backup spreadsheet for reference use only, and not required to be downloaded.  So there is no need to file convert into a TXF file.  Very confusing, by both parties.  These should be addressed, as the CSV file is labeled as a Schedule D, but the Document ID file contains the same information as the Schedule D, but is not identified as a Schedule D.