Thank you for responding to my question.

I am using the 2020 Basic program on my new computer. My old computer has 2019 program and data files. I copied the data files (3 per client) from the old computer onto a thumb drive then used the  transfer menu in the 2020 program to bring the files into the 2020 data files on the new computer. I can open the federal return fine, but when I go into the state return I get this message: "ProSeries could not locate the state file to transfer. If you have a 2019 state return for this client it can be transferred to this return. Note: if you choose don't transfer you will not be able to subsequently transfer data for this return."

I select transfer and the program prompts me to locate the file. I have tried both the cache and pmd extensions and they are not recognized.

Are all data files (fed & state) in the file labeled 19Data?