The download given here is a non operative version.
You need to purchase the plugin at the following link, to get a working copy:
http://www.codediesel.com/plugins/country-filter/
You may also be interested in the related 'Country Redirect Plugin'
http://www.codediesel.com/plugins/country-redirect
Version 1.0
Initial Release
Version 1.01
Minor bug fix
Version 1.1
Support for nested shortcodes
Version 1.5
Added new function and modified some function logic
Version 1.5.1
Added check for 'ip2nations' database table presense