Last week after reading about Flex Builder updates in Artima.com, I decided to update my Flex Builder 3. So I fired up my Flex Builder 3 and go to:-

Help->Search for Flex Builder Updates...

However, nothing happens. After googling for a while, I found out that the Adobe Updater is not installed, you need to execute Setup.exe in the following directory:-

{YOUR_FLEX_BUILDER_INSTALL_DIRECTORY}/AMT\AdobeAUM5.1All.win
.installer/Setup.exe

Once it's setup, select again (try restart Flex Builder if it doesn't work):-

Help->Search for Flex Builder Updates...

The update process should be started.

Just wonder why it is not installed during installation of Flex Builder 3?