Upgrade the Booking Calendar from Free to Paid version.

1) When you made the purchase of Booking Calendar paid version, you have to receive the link for downloading the paid version of Booking Calendar. Please download this archive.
2) Open firstly the General Booking Settings menu page of Booking Calendar admin panel, and at the right side of the page recheck that this option "Delete booking data during uninstall" is turned Off (unchecked), otherwise all your booking data during deactivation will be deleted.
3) Open the WordPress Plugins menu page and click on "Deactivate" link of Booking Calendar (free version). Wait for the message "Plugin is deactivated successfully". It's important.
4) Now click on "Delete" link of Booking calendar and wait until the plugin is deleted.
5) Please open the WordPress Plugins menu page, then select the "Add new plugin" sub menu and then select "Upload" tab at top of page. Click on browse button in upload form and select the booking zip archive, which you are received. Click on upload button and wait for until the plugin is uploaded.
If you want to upload the booking zip archive using the FTP (for example using the FAR application), so then you are firstly need to extract the archive content - you have to get at result the booking folder with plugins files. Then upload entire this folder to the ../wp-content/plugins/ folder at your server.
6) Now open the WordPress Plugins menu page and click on "Activate" link.
Wait for the message "Plugin is activated successfully". It's important. Otherwise not all DB tables will be created, and you will have an error messages.
Please clear the browser cache, because update can have a new updated CSS or JS files.
Now you can use your updated version.