Your 6.x SDK applications must be recompiled after updating the namespace from Senstar to Seer.
Changes to C# namespaces:
Senstar.Connectivity -> Seer.Connectivity
Senstar.Symphony -> Seer
Senstar.Symphony.Configuration -> Seer.Configuration
Senstar.Symphony.Internationalization -> Seer.Internationalization
Senstar.Symphony.SDK -> Seer.SDK
BaseLibCS -> Seer.BaseLibCS
DeviceModel.Client -> Seer.DeviceModel.Client
FarmLib.Client -> Seer.FarmLib.Client