Today the PowerShell Team released a new version of the WMF : v5 September preview, I really like the faster beta cycle !
Having the beta preview already installed (July version), I first open Add/Remove Programs (appwiz.cpl) and start to uninstall this version (KB2969050).
Once the uninstallation is completed, Windows ask to reboot. However at the next boot I get a message saying the Update did not work and Windows is Undoing the change, reverting to the previous state...then reboot again.
