Was about to post the link but looks like you have it.
Toyota USA do a similar system where I got the manuals for my FJ. If the download method is the same, and I would guess it is then take our your subscription on a day when you have NOTHING else to do. Each 'chapter' has to be downloaded as an individual file, not as sections or as a complete manual you need to have a suitable way of saving it as a PDF (I have a Mac so that was easy) and you have to download every single one separately... easy but very time consuming. I took a two day subscription and took most of that time.
Also check the 'day' for the sub, for the US it ended at 10pm PST the day after you subscribed so if you timed it right you got quite a bit of extra time.