UserConfig.xml is not part of the installation package. Instead, it gets created as you create users in Xeams. Moreover, you should never re-install Xeams unless you first backup your configuration.
The RPC error you're getting is not because of DNS. It is happening because:
- Some Javascripts have been cached by the browser and do not match with the server's copy. Click F5 in the browser to see if that takes care of the problem.
- Perform a manual update following instructions on https://www.xeams.com/manuallypatching.htm
Contact our support department via email (support@synametrics.com) if the problem persists.