I have just released new version of OSM Scout Server: 3.0.0. New maps are also out.
Changelog: Release 3.0.0 · rinigus/osmscout-server · GitHub
Announcement: 3.0.0 release · Discussion #416 · rinigus/osmscout-server · GitHub
New maps are incompatible with the old server version as well as old maps are incompatible with the new server. So, if you update the server, you would have to update the maps as well.
I have also opened Github discussions - feel free to discuss the release over there. Should allow users from different platforms to communicate.
For Sailfish OS, update is available via Chum.