Do I need to download the patches for each day where it says "Final" or is there a patch I can use for the entire week 1-3?
Ngl, you may as well wait a month until the next update is out. If you figure it all out now and play you'll lose your progress anyway. Because they are merging all the weeks together, and saves will then be compatible forever. With this merged update. Meaning you'll have to replay the whole game if you play with this current format, which is very large, when the next update arrives
If you want to play it now still, then week 1 has its final patch, as does week 2, and for week 3 is called day 20-21, but that should include the entirety of week 3 (The naming of it is very poor).
P.S when the merge arrives, I assume it'll be 1 file, and so it should have only 1 patch. Logically thinking. So it'll also be much easier to apply the patch and play it normally. Rather than as it currently is, which is all separate