Overwrite the whole data from 2019090300 (The very first A20 data separated from A data) then overwrite from 2020020300 to all updated versions (including 2020031700 aka final update of A20, 2020072800, 2021031600, 2021080400, and 2022020200) and finally 2022070400. Delete the license songs that were removed from the game (sadly, tried opening startup.arc with DDR A-A20 manager but ended up giving me a "Unhandled exception" error message instead).