Mod Installer has integrated update system (UOTA - Update On The Air), so everytime when there is a new version available, orange U button appear in the right top corner.

Changelog is always displayed in description area when you hover over the U button.

To start the updating process, click on the U button, it will automatically update Mod Installer and also main modpack (Resistance, Libertad, etc...).

You can also do manual update. Simply download new version, extract it and copy SettingsFC.xml file to the new version's folder.

Please, never overwrite old folder with the new one, because there can be changed which can produce bugs.

Updates are optional, but if want to report bug, then make sure you're using latest version.