I have imported all the sample data except media files. Hope you have already saw the error while importing sample data.
An error has just be found.
The file is empty . Upload something more substantial . This error might be because uploads have been disabled in the php.ini file or by the fact that in php.ini post_max_size was defined less than upload_max_filesize .
To resolve this issue you may need to lift the php values like post_max_size ,upload_max_filesize,max_execution_time etc in file php.ini. Your hosting provider will help you to resolve this issue.
Anyways we have imported all the needed sample data.