If you are in the process of trying to upgrade to the January WP7 tools and you are running the WindowsPhoneDeveloperResources_en-US_Patch1.msp package make sure you have closed down your emulator.
I have found that when I had my emulator up and running the installer would launch, run for a second then close w/ no message. When I closed down the emulator and re-ran the package it ran and completed correctly.
It is possible this is just my experiences during this install, but I thought I would share this in case someone else out there was wondering why the installer is starting and stopping without any messages.
Till next time,
02-09-2011 7:20 AM