You guys should be able to see one of the potential problems just by looking at all those replies and from the other post. A lot of people are trying to download the patch if there is a lot of people trying to download the same file at the same time it will go slow. I'd recommend you wait for an off peak time and try again then. I downloaded the patch last night at around 2 am EST no problems at all. Loaded the game up and then shut it down as I had to go to bed for work.
Also I'd suggest doing a cold re-boot shut down the PC leave it for a minute then start up. Close all other processes and make sure Arc and STO is the only thing working. that will help too when the pc is still cold