How can I resove this error message when importing demo data? Thanks

Envato Customers Web and Code
1

An error occurred while fetching file from: http://tommusdemos.wpengine.com/theme-assets/stack/demo-data-vc.xml!
Reason: http_request_failed - cURL error 28: Operation timed out after 20016 milliseconds with 3320323 bytes received.

2

Try to increase max_execution_time in your PHP configuration. Here is a link on how you can do it:

If this doesn’t help come back.