It works fine for me. I have several 2020 .tax files that I test with an they all transferred to 2021 without a hitch.
Also transfer only READS the .tax filwe and cannot write to it. If you still have the 2020 version try opening the 2020 .tax file with that (use "File -> Open Tax Return", don't double click the 2020 .tax file or it will try to use the latest version of the software (2021 not 2020). If it will not open then the file is corrupted.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
