CretaサポートDoes the launcher update itself?
まだ日本語では提供されていないため、原文で表示しています。上のメニューから翻訳できます。
Yes. On start-up it checks for a newer release and, if there is one, asks whether to install it, showing the new version number. Choose Update and it installs and restarts itself; choose Later and it asks again next time.
Updates are signed, and one that fails the signature check is refused. If the check cannot run at all — no connection, for example — the app starts normally and tries again next launch.