I'm still waiting 6 more days before i will play but I wanna ask, how exactly are you all extracting the archive?
Are you opening it and moving the files to a folder or moving the archive with right click and extracting to that location? Because those are a bit different (go read about it). There can always be Memory issues if it's a .rar and was archived with dictionary size over 1024MB, it might be that you have not enough RAM, it even sometimes will show it as bad archive.
Still i have not checked that archive, since no idea where it is
And yes the game was remade for easier and more streamlined work. I would not be surprised if day 8 would come out 5th-10th next month but If i recall correctly its gonna be 8+9, so most likely not until the end of next month. of course i hope I'm wrong.