I updated several servers (Nomad Domino and Nomad Safelinx), and did not get such a warning.
What I did experience - like on previous Nomad updates - the client side update is not as seamless as it is with Verse.
When you have Nomad already installed in your browser, the first run after updating the server is most likely causing a startup hang and maybe showing some random error messages or blank load screens. After closing and restarting the browser app, the local update is properly installed with no further warning. This behaviour was consistent since 1.0.3.
Verse, on the other hand, prompts you properly wether you want to upgrade your Verse app, Nomad does not.
Regards
Friedhelm