Hello. Please. I cant install dummy content. System display me: AJAX import error. Try to disable all external plugins and run the import again. If it doesn’t help, contact our support center for further assistance.
You are trying to upload the demo being on the child theme, your Woocommerce is not updated, you have not installed and activated WoodMart core that all caused the issue.
Dummy content has been uploaded now, you can upload any.