Looks to me like you are trying to run this on the original 23.0 database, but the file is verified for updated database 23.4 and will not work on older versions.
Check the 'Database' drop-down and see if you can choose 23.4.
I didn't know where to find it also so I just copied it from the game itself into an excel.
Nation
Playable level
Croatia
2
Argentina
2
Australia
1
Austria
2
Belarus
2
Belgium
3
Brazil
3
Bulgaria
2
Canada
1
Chile
2
China
2
Colombia
2
Czech Republic
2
Denmark
4
England
6
Finland
2
France
4
Germany
3
Greece
2
Netherlands
2
Hong Kong
1
Hungary
2
Iceland
2
India
1
Indonesia
2
Ireland
2
Israel
2
Italy
3
Latvia
1
Malaysia
2
Mexico
2
Northern Ireland
3
Norway
4
Peru
1
Poland
2
Portugal
4
Romania
3
Russia
2
Scotland
4
Serbia
2
Singapore
1
Slovakia
2
Slovenia
2
South Africa
2
South Korea
2
Spain
4
Sweden
4
Switzerland
2
Turkey
3
United States
1
Ukraine
2
Uruguay
2
Wales
2