You can any time switch to another update server as follows:
Navigate to %ProgramData%\iManage\AgentServices\configs .
Open the update.ini file . In this file, under the [General] section, the update server location is set for the server property . For example: updates.imanage.com/Updates/Work10
Set the desired value to the server property.
Select Check for Updates in iManage Agent to pull the latest update.ini from the newly specified server path.