theme not functioning

hey good day im having a problem the child theme is missing an style sheet im not getting the demo on the theme to show on my webite site am attaching some photo to show you guys hope you all can help me .Im using the [Nielsen - E-commerce WordPress Theme by sara p okay version 1.9.0



You can ask help or contact with that item author @sara_p right here as a comments

And this is your purchase item support

hope they will help you out from your issue.