That walkthrough is from version 0.50.
There's no walkthrough for 0.80+ because the wiki that used to have it (run by the Furukawa person) was nuked. That walkthrough was usually updated.
Wait really? I thought Changer is Updating his Walktrough
Nope, he relied on the Wiki to inform people on how to access stuff after finding out that there was one.
ok thanks for telling me. Do you know why Furukawa was nuked?
Because the wiki was for an 18+ game.
Here's a picture of Furukawa's reaction to it.
ok Thank you, I dont think that it was a good Choice from them to delete this Walktrough since they Probably lost a Lot of Viewers.
They deleted the wiki.
And no, it was not a good choice of them. No one thinks so. And no one has made another wikia AFAIK.
EDIT: Furukawa's old walkthrough can now be found HERE