In case you get "Error load data from..." messages when installing dummy data, this means that the import from external files is not allowed on the server.

Please enable allow_url_fopen on the server using one of the following methods:

1) edit .htaccess file and add line: 

php_value allow_url_fopen On 

2)  edit php.ini file and add line:

allow_url_fopen = On; 

3) Contact your hosting provider.

In case you still have any issues, please provide your website details in the support ticket:

1) website url and Wordpress username/password

2) FTP details: FTP hostname, username and password

3) Direct link to PHPMyadmin tool (or your hosting Cpanel credentials).