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From the SWTOR forums:
As some of you have already noticed, we unintentionally released the patch data for Game Update 2.4 this afternoon at 2:46 pm CDT before its scheduled deployment.
If you have already begun patching or completed patching, we recommend that you do not run the Launcher until after tomorrow’s maintenance. If you do not run the Launcher until tomorrow, you will only have to patch Game Update 2.4.
If you do (or already have) run the Launcher again prior to tomorrow morning’s update, you will need to re-download the entire game client.
**Please do not attempt to log in or patch at this time.**
We apologize for any inconvenience this has caused.