You can update the WP Booking System Plugin without updating the Bellevue theme, although we recommend always using the most recent version of the theme and plugins.
* Always make a full database backup of you website before performing any updates.
To find out how to update the theme please see: https://themovation.ticksy.com/article/3825/
To update the plugin only without updating the entire theme:
- Get the latest version we have shipped with in the theme download package from your ThemeForest download page
- Remove '/wp-content/plugins/wp-booking-system' directory on your website using FTP
- Extract the download package file and find 'wp-booking-system.zip' - depending on which theme that you are using it could be in several locations:
- Bellevue theme: folder '/wp-content/themes/bellevue/plugins'.
- UnIp wp-booking-system.zip and extract the 'wp-booking-system' directory to your computer and upload it to '/wp-content/plugins/' directory using an FTP program
- Activate the plugin in the Plugins page
You should be using the most recent version of WP Booking System which is version 3.4.2 at the time of writing this article dated September 21, 2016.
If you have any question you can always contact support and create a ticket here: https://themovation.ticksy.com/
Happy to assist.