Returning player here (from ARR launch), trying to install the game on a new computer.

I don't have a physical copy of the game since I purchased a digital copy.

How do I download the game without already having a subscription? Because it's liable to take days to download the whole thing, and I don't plan on purchasing game time just to waste 3 days of it downloading the game. So far, the only download option I've found is a 100 MB file that then tells me to get a subscription before I can do anything else.

Please advise.