If you attempted to import the sample demo data, but it never completes the installation process or it fails with errors, there could be several reasons. Please read the following information.
If you have a duplicate menu item issue, please follow:
Likely Causes For Demo Import Failing
- Your PHP memory, file upload size, and/or execution limits are set too low
- Your web host uses process watching software that prevents bulk processing on their web servers.
Recommended PHP Configuration Limits
And you can also check your PHP error logs to see the exact error being returned.