Star Wars: The Old Republic tonight, you might want to take a look at a BioWare forum post first. It seems as if the company accidentally rolled out its 2.4 patch a day early and as a result, some players have had to re-download the entire game client.
"If you have already begun patching or completed patching, we recommend that you do not run the launcher until after tomorrow's maintenance," BioWare says. "If you do not run the launcher until tomorrow, you will only have to patch Game Update 2.4."
[Thanks to everyone who tipped us!]
[Update]: BioWare has restored previous patch data and says "you are fine to play normally."