You can easily check for the latest published version of Matukio by visiting https://compojoom.com, logging into the site and going to Downloads->Matukio (you need a valid subscription).
Updating Matukio to the latest version is by no means different than installing the component! You do not have to uninstall the previous version; in fact, you are discouraged from doing so. Simply follow the installation instructions so as to install the latest Matukio version over the existing Matukio installation. That's all! All your settings are preserved.