Hello.
If you are want to make the FULL reinstall of the plugin. Please follow these steps:
1) Open firstly the General Booking Settings menu page, and at the right side of the page recheck that this option “Delete booking data during uninstall” is turned On (checked), its means that all your booking data during deactivation will be deleted.
2) Open the WordPress Plugins menu page and click on “Deactivate” link of Booking Calendar. Wait for the message “Plugin is deactivated successfully”.
3) Open the WordPress Plugins menu page and click on “Activate” link of Booking Calendar. Wait for the message “Plugin is Activated successfully”. It’s important.
P.S. You can request the new updates of paid versions of Booking Calendar on this page: https://wpbookingcalendar.com/request-update/
Kind Regards.