1. be a Icaros Desktop 2.1 user (but it may work on Icaros 2.0.3 as well: try this at your risk, it's not officially supported)
2. download new LiveUpdater here and save LUPD211.zip files somewhere
3. run your current LiveUpdater and choose the "File" option
4. locate LUPD211.zip
5. ...and wait for LiveUpdater updating itself.
Why is it called "LiveUpdater 211"? Because it may be needed to upload Icaros Desktop 2.1 to the incoming version 2.1.1 (which will bring final OWB 1.25 and correctly-exiting VICE 2.4).