A common issue that can occur with users new to installing WordPress themes is a "Broken theme and/or stylesheets missing” error message being displayed when trying to upload or activate the theme. This error message does not mean that the theme you have purchased is broken, it simply means it has been uploaded incorrectly. Luckily, there is a very easy fix.

For some reason custom slugs (rewrite rules) are not automatically set/saved by theme’s demo data import for Dog and Event categories (issue noticed since WP version 4.8).
That’s why you’ll need to enter these two manually and save plugin settings!

Please note that the problem occurs only when demo data is imported via WordPress Importer plugin.
The theme package contains importable ”.sql” file and if you use it to replicate theme’s demo site, no need to do the fix!

Here are the screenshots for better understanding:

Screenshot 1: Dog Settings
Screenshot 2: Event Settings