If you face any problems related to demo content import and you do not see successful message after import, follow please documentation related to Demo Content where you can read what to do if your content has not been correctly imported.
In some cases (usually if your WordPress installation has different than English version) you can see blue boxes informing you to “Enter some content to the textarea in the Text element”. The reason is that our demo content has language mutations but your WordPress currently contains only one language. The solution is to install and activate Ait Languages Plugin.
If nothing of that helps, feel free contact our customer support.