Server for v4.8.3 is in UberServer.
The server IP address is compiled into the client.
In Assembly-CSharp.dll -> ApplicationDataManager, put IP address in:
WebserviceBaseUrl and ImagePath
example with IP 13.38.94.69:
ApplicationDataManager.WebServiceBaseUrl = "http://13.38.94.69:5000/2.0/";
ApplicationDataManager.ImagePath = "http://13.38.94.69:5000/images/";
Take the folder UberStrike_Data and replace it in UberStrike steam installation:
C:\Program Files (x86)\Steam\steamapps\common\UberStrike