You can try the free version of the theme for as long as you like
Or you can purchase the theme and try all the features
If by any chance you are not satisfied with the theme or it’s features, or it is simply not suited for your website, you can always request a refund within a 60 day period.
If you modified theme files in the theme directly, these changes will be lost when you install the theme or update it in the future. You will have to make them again, or use a child theme for theme file customization