Day 7 Final (final as in no additional image/text will be added but fixes can happen)
Day 7 final has day 5,6 and 7 in it, if your game cannot start when you select your save from day 6 (after last decision) then simply use a save before that, or even day 4 (after last decision)
Day 7 Tree, does not exist for now. As for day 6 I saw it somewhere in discord, some time ago. I kinda don't have the right to post it.
About Week 1 release. It basically means that Day 1 and Day 2 were released, they were much worse, when it comes to English translation, Day 3 was translated by someone who joined the team, after day 2 was released. So the main reason for day 1 and 2 remaster is/are
English translation, Renders of better quality and additional tweaks, week 1 will have fully working phone.
blah blah blah
Visit Blue's patreon page and find the week 1 poll, the option 3 won, read it to find out more. Blah blaH