I tried several methods listed here, and did not get an update to the game with any of the methods. So I thought I would post what worked for me. I am using the Station Launcher that has always been on my game access screen.
1. Go to the EQ2 folder and drill down into the Legends of Norrath folder.
2. Delete the file called Legends of Norrath.dll
3. Run the Update.
This worked for me, and I have both the live and test server versions installed.
It was failing the update on both. I used this process first on my EQ2 live installation and it worked.
Then I used the process on my test server install and it worked for that also.
Happy Gaming! :-)