I'm using Mathematica 10.0.2 for Mac, and for the first time just tried CountryData.

Executing the first example in the documentation of CountryData was fine:

CountryData["France", "Population"]

but the second one failed:

CountryData["G8"]

with the following error messages:

General::aofil: /Users/ME/Library/Mathematica/Paclets/Repository/CountryData-9.0.64/Data/CountryData.wdx already open as /Users/ME/Library/Mathematica/Paclets/Repository/CountryData-9.0.64/Data/CountryData.wdx. >>

OpenWrite::noopen: Cannot open /Users/ME/Library/Mathematica/Paclets/Repository/CountryData-9.0.64/Data/CountryData.wdx. >>

General::stream: $Failed is not a string, InputStream[ ], or OutputStream[ ]. >>

General::stop: Further output of General::stream will be suppressed during this calculation. >>

SetFileDate::nffil: File not found during SetFileDate[/Users/ME/Library/Mathematica/Paclets/Repository/CountryData-9.0.64/Data/CountryData.wdx,{2014,3,7,13,31,4}]. >>

Then I removed ~/Library/Mathematica/Paclets/Temporary as an attempt to solve this.

Now CountryData["G8"] just gives me

$Failed

without anything else.

Do you have any suggestions for what I should try to restore the functionality of CountryData?