I pre-purchased the game for the head start tonight. I bought the game a few days ago and downloaded the client. I opened up the client tonight to test it out and I am downloading another massive file.
Was this new download released very recently or did my first attempt to download and install the game fail?
Unless what you're downloading is upwards of 200,000 files, you're downloading all the patches and updates that ANet has released since you last opened the client. They've done a lot, so it should be pretty massive.