First download the latest version, either Installer Package or No-Install Package.
Close any running instance of XYplorer, and install the new version over your current one. Done.
Extract the package to your XYplorer application folder and overwrite the existing files. Done.
If you own a Standard License Pro you might want to check before upgrading whether your license covers the new version. You find this information under menu Help / About XYplorer. If you own a Lifetime License Pro you don’t have to worry.