Could you please clarify if you mean Host or Agent? In case if it's Host, you can simply update it using one of the methods described in this tutorial on updating Remote Utilities, i.e. if you'd prefer to use the Self-update method, then creating a new MSI file is not necessary.
In case if you meant Agent, then you can simply create a new Agent package following this tutorial.
Yes, unfortunately, if you use Agent, then you need to build a custom Agent package in order to update its version. However, we plan to add a feature in our future updates that will allow saving MSI Configurator's settings that were previously used in order to make such updates easier.
Alternatively, if you use the default Agent, it's possible to just re-download the latest version from our download page.