How to make my wordpress website look exactly the preview of this theme?

How to make my wordpress website look exactly the preview of this theme “Foodie World”?
I just realized whatever theme I choose it never looks like the one in the preview. Can you please help me with this? I have googled as well but hard to find a solution. One of the websites said I need the upload .xml file present in the theme archive folder after extracting it but no luck. I could not find any .xml file anywhere in the theme folder. Please help! I’m going crazy thinking about this issue, it’s really frustrating. What if I had purchased a theme and it did the same then I’ll simply waste my money. Not just this theme but any theme. Kindly help!