Week 1 full is only days 1-7. It is the final version of those days. The dev was releasing these in batches to get content out. The game is (supposedly) still in development, and this is common practice.
A consolidated "month 1" version is supposedly in the works. However, with the lead project manager (who is apparently irreplaceable) being very sick (rumored to be deathly ill) and Blue Cat, the dev, being radio silent for over a month, there is a distinct possibility that this game has been abandoned. Blue Cat maintains a token presence on the discord for the game, but ask any serious questions about whether or not this has turned into a Patreon scam and you are insta-banned.
these were all packages made in 1-2month batches when the game development started to keep people interested/aware of progress and your basic updates to the game, they started as 2-3 days each update. they aren't completely removed sometimes, but Final projects come out as Full Weeklong(7 Days) packages. As a note the Weeklong Packages normally have a bit more content that isn't always shown in the 1-2/3 day files since they are completed works. And just as a note, take anything anyone says with a grain of salt since before 2020 updates and the amount of content made in the time this game started is impressive on it's own, this past year's just fucked over alot of ppl. So just keep an eye out over the next year or so, cus it is a very high potential/ambitious game.