In your purchased Main files (InfoCenter – Knowledge Base and Q-A WordPress Theme.zip) you should find two different .xml files of demo data.
If you want to import content from http://fluentthemes.com/wp/knowledgebase/ , you should import this file: Infocenter_KnowledgeBase_Demo_Data.xml. And, if you want to import content from http://fluentthemes.com/wp/knowledge/, you should import this file: Infocenter_QA_Demo_Data.xml. Here we are describing how to do that.
Navigate to Tools > Import from your WordPress Admin Dashboard. There you will see a list of import systems (blogger, blogroll, wordpress etc). Choose WordPress from there and you will be asked to install the WordPress Importer plugin.
After installing and activating the WordPress Importer plugin you will need to upload our demo data xml file: Infocenter_Demo_Data.xml or Infocenter_KnowledgeBase_Demo_Data.xml and click Import. Wait for a few seconds and you are – All done – Have fun!