Bootstrap Version Conflicts
The carousel is built for Bootstrap 3. Themes shipping Bootstrap 4 or 5 use a different, incompatible carousel API.
The carousel is built for Bootstrap 3. Themes shipping Bootstrap 4 or 5 use a different, incompatible carousel API.
If your carousel shows the first image but never advances, the theme is most likely not loading Bootstrap JavaScript.
The full feature list of NEO Bootstrap Carousel and the WordPress, PHP and theme requirements you need to run it.