Thanks for writing in!
To setup, the demo contains, we would like you to please set up a demo/staging website.
Installing demo content to live site is not recommended as it may delete and change the setting/content of your website.
Similar to your website you can create one staging site in your server.
Example: www.staging.hsa.hr or www.hsa.hr/staging which has complete diffrent wordpress installation.
Also, you validate the staging site with the same license.
Please check the validation process here.
Hope this helps!