There are 2 files in the ZIP folder, the one that starts with X is the nation file, whilst the one with A adds some club and competition histories for 2020 and 2021 I recommend using them both.
Premier League > 14 teams > 2 Relegations
First League > 12 Teams > 2 Promotions > 2 Relegations
Cup > Qualifiers > Groups Stages > Knockouts
Super Cup > Semi Final > Third Place Playoff > Final
2 U21 and U18 leagues
KPL match rules updated.
[NOTE] The only available start dates are of 2022, since the 2021 season finished IRL (which is why I suggest using the A file), you can of course use the start date of a different nation should you wish to play the 2021 season, then you shouldn't use the history file.