It's been over 2 years since I logged into one of my websites using X Theme. In the theme editor it shows version 3 (see below), but online it shows that there's a version 5.0. How do I upgrade? Do I have to uninstall the theme and re-install the new version, if so, will I lose everything?
Theme Name: X
Description: An immensely powerful and endlessly customizable WordPress theme.
License: GNU General Public License v2.0
Text Domain: x