Since Konami servers for PES 2020 are offline, you must go to Settings > Apply Live Update to reset the default squads to your new option file. If it fails, manually go into Edit Mode > Team and restore default squads first.
When you apply a 2024 Option File to your PES 2020 PC version, here is what you should expect to see changed: Pes 2020 Option File 2024 Pc
Select "Import Team," check all boxes, and ensure "Apply Player and Squad Data" is ticked. Since Konami servers for PES 2020 are offline,
Wonderkids and missing players not found in the original 2020 database. you must go to Settings >
Conflicting stadium files or an over-stuffed EDIT file. Fix: Delete EDIT00000000 and reapply. Ensure you have no other mods (like a different scoreboard) active.