Install Theme and Import Sample Data issue

* Many issues that you may run into such as; white screen, demo content fails when importing and other similar issues are all related to low PHP configuration limits. The solution is to increase the PHP limits. You can do this on your own, or contact your web host and ask them to increase those limits to a minimum as follows:

1 - Please make sure you have done the properly installation order is: install & active theme > install & active plugins > install Sample Data.
2 - Increase your PHP Configuration Limits, bellow is the recommended of PHP Configuration:

• max_execution_time 180
• memory_limit 128M
• post_max_size 32M
• upload_max_filesize 32M

** If you have done all but still encounter this issue and your web sever is Nginx. It might be problem of Nginx server configuration has the too low response time. You should increase the timeout to 300 the try to reinstall the sample data.