Find folder 2111 for FM21. On Steam, go to Program Files (x86)\Steam\steamapps\common\Football Manager 2021\data\database\db\2111. In Epic Games, the address is different - \Program Files\Epic Games\FootballManager2021\data\database\db\2111.
Open the Inc folder, then all and delete three files - Lic_dan_swe_fra.Inc, Nleague.Inc, Fake.Inc.
Now copy or cut the FM21 Fix by FMScout.Inc and FM21 Club Names by FMScout.Inc files extracted from the archive and move them to the same all folder.
Go back two steps from the folder and open the edt folder. Inside it, open the permanent folder.
Delete the fake.edt file.
Go back two folders again and open dbc and then permanent. Delete 6 files at once - Zebra award.dbc, Zebra turin fake staff.dbc, Brazil_kits.dbc, Forbidden names.dbc, Licensing2.dbc, Licensing2_chn.dbc.
Now you can safely launch FM21 and enjoy the result!