UPDATE
This early access FIFA 21 Modding Tool allows users to have access to Legacy files and Legacy Mods.
It has support for FIFA 20 and FIFA 21.Â
This tool can be used in 2 ways.
1) Place mods in the correct place in the LegacyMods/Legacy folder. (for example. the db is in data/db)
2) Import lmod files into the launcher and launch the game (this will automatically create and use the Legacy folder)
If you are a modder and want to know where all the legacy files are. Thats a tricky one right now. You will need to get them out of memory yourself. I am looking to dump ALL legacy files out as soon as I can.Â
If you do have access to files, you can use the "Editor" button to compile your files into an .lmod for the launcher.