in my site required the Royal_Theme-version 2.3 please help me how to download the lowest version of that
It’s best to contact the author and ask if they have the files for version 2.3. But that version is very outdated (October 2015) so you really should avoid using it if possible.
The latest version of the theme will be found in your Downloads area. But you’ll need to contact the author if you’re looking for an older version. They may be able to help you.