Users of Icaros Desktop 1.2.5 that wish to update their distribution to the incoming version 1.2.6 will have to install a corrected version of LiveUpdater, which unfortunately doesn't work anymore (we spotted the issue during our internal tests, when trying to update a 1.2.5 installation with the incoming update-disc). The new version of LiveUpdater comes as second official patch for Icaros Desktop 1.2.5.
You can find the patch in our centralized Download section, under the Updates section, named Icaros Desktop 1.2.5 patch 02.
Here's how to install the patch: please extract the archive wherever you like (even in RAM:) with ZuneARC, and move there with Wanderer. Inside the drawer "patch12502" you will find two files with icons, patchinfo.txt and Patch125-02: the first one includes a list of the changes applied by the patch, the other is the installer. Just double click on Patch125-022 to install everything in the right places.
Note: if you're downloading the patch with OWB, you'll find the icaros-patch12502.zip archive in MyWorkspace/Downloads drawer. To see it, remember to choose View -> All files in the Window menu of Wanderer.