Hello,
You are welcome!
The latest version of Revolution slider you can always find here https://www.8theme.com/download-plugins/ and also all the other included plugins. You can update plugins manually via FTP or delete and install plugin again using the new archive.
Staging site is a full copy of the existing site, you can read more here https://themeisle.com/blog/wordpress-staging-site/ Before update production site it would better to make the update on staging site and then decide what things should be changed to proceed with the update on the production.
Regards