dkh
Level 15

To transfer clients for the first time from 2019 to 2020....open 2020 Program - select from the top left :  File then Transfer from the dropdown menu        or    select Transfer icon from second row

The only reason to have an overwrite issue is if you have already transferred 2019 to 2020 and need to re-transfer.   If that is the case,  I would delete the 2020 files, then transfer.

Hope this helps