In order to properly import the demo content, it is necessary to follow some steps.

1) Install the WooCommerce plugin

2) Install  Widget Importer & Exporter plugin 

3) Install Monobooth theme and click the import 

WooCommerce will ask if you want to install WooCommerce pages. You should not approve that, because the pages will be imported. The only thing you have to do after the import is to go to WooCommerce-> Settings-> Checkout and select the correct page for the Cart and Checkout page.