You can use WordPress Import tool to import data.

Step 1: Install WordPress Import plugin

Login to your WordPress dashboard, and navigate to Tools  Import. If the WordPress Importer is not yet installed, click Install Now.
WordPress Import Tools

Step 2:

At the bottom part of the WordPress dashboard, click Run Importer under WordPress row. You will be redirected to WordPress Import screen.

Step 3:

Click Choose File and browse for the .xml file you have previously downloaded. Upload file

Find file content.xml at mixxcazt/dummy-data/content.xml
Find file home page at mixxcazt/dummy-data/homepage/home-17.xml

Step 4: Click Upload file and import, and assign an author if you need to assign different author on it, then click Submit.
Upload file content

Step 5:

Wait for the importer to finish the import.

If you need to help, please let me know.

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