Currently, we are checking the Car Rental System v5 changelog. you can also check it from the below URL
CRS v5 Changelog:
there are so many changes that have been made to the above updates and that’s why our developer need some time to update our theme to the latest version of the above plugins. In the meantime, we will request you to stick with the previous version.
Our developer will keep you updated with the work progress in this status.