I run the installer and click next twice, then it goes to the screen about Google Toolbar, but there is nothing else on the dialog and the install button is grayed out, leaving no possible way to update.
I used to see this now and then, haven't seen it for a while now (thought they must have changed things to stop it) but a reboot of the PC should fix it.
Used to happen in DF when installing as well - can't recall the circumstances.
May have even been as simple as aborting the uninstall and trying again.