Adobe hasn't been making it easy for anyone wanting to update from version 1.3 to the latest version (1.4.1). First of all there was the infamously botched 1.4.0 release last month, which was full of bugs and now, after a debugged 1.4.1 was released last week, it has been nigh on impossible to download it.
And why do you have to re-enter your licence key when you run the update. I can imaging photographers out in the field updating their Lightroom installation and being faced with a useless installation until they can get back to base to dig out the licence key numbers
Brilliant piece of software, Adobe, but you need to pull your socks up when it comes to support and update delivery!