I'm on Franz 4.0.4 and I can't automatically update to Franz 5
In Franz 5 we have added tons of new features and have completely revamped the whole infrastructure and how services are provided and synchronized. In other words: Franz 5 was rewritten from the scratch. This also means that for technical reasons, we are not able to do an automatic update from Franz 4 to 5.
To update to Franz 5, please download the latest version from here.