To download the theme from ThemeForest you need to enter the downloads area ThemeForest account, where you can view all your purchased themes. Find the Royal template among them, and click on the Download button to the right of the main content. You can download the theme’s .zip file from there.
Read more in our documentation – https://www.8theme.com/demo/docs/royal/Theme_Update
Feel free to ask if you have any other questions.