Just wanted to update that I need to run the file everytime I boot rotwk. If I try to launch from the T3A shortcut off my desktop I will hit the error. I think this is because it doesn't auto run as administrator if you just open the client.
Steps for full clarity:
Hook rotwk in T3A online launcher then close it.
Enter your programx86 electronic arts, lotr rotwk folder.
Right click lotrbfme2ep1.exe and select Run as administrator.
This should open the T3A launcher.
Then select rotwk
You should be able to proceed past the online screen and login without the update crash.
You need to do this everytime you want to load the game.
I also uninstalled the version of rotwk and reinstalled the iso that was on the guide linked above but i'm not sure that had any impact as I didn't try running the previous versions file in administrator.