I'll try to create a new download link for you. Please give me a moment :)
I have created another download link called "[premium] in case the other doesn't work". Please try to see if that one works. If you're still having problems, please try deleting the autosave data from this folder:
Go to your windows C: > Users> YourUsername >AppData (this is a hidden folder. make sure hidden folders are shown) >Local >nw-app >User Data >Default
Please let me know if it works.
Thank you so much!! Deleting the default file worked and it seems to be running now! I'm so sorry for all the problems and I'm so glad I can continue playing the game now O^O This is a lovely game and I really appreciate the help. Strangely though I think the only thing that still seems odd is that I still cant go through the right staircase to see Yandere as I think I completed everything else. I will definitely check out the other games as well!
So, I have tried myself and it works for me. This is what I did, could you confirm this is also what you have done?
--SPOILER AHEAD---
-I downloaded the second file
-I got all common dolls
-I took scissors and matches to kill the broken dolls and Okiku-san
-I got the yandere doll and sent him away by talking to him
-I got Mirror Helen
-I chose true end
-I watched the animation and opened the dolls' room following the order on the sticker
-I went upstairs and clicked on the red book
-I chose the option "I don't have any wish"
Then I went to check the stairs next to the Japanese door and the yandere doll was there.
Just in case, I'll create a new download link with the stairs unlocked so you can play it at least :)
I think I had previously made a mistake in choosing the other option instead of "I don't have any wish" and I think that was probably why I was not able to access the staircase on the right. I followed your points by redoing the true end and it worked out!! I'm so sorry you went through the trouble of creating a new download link and I'm so glad I can experience the full gameplay now :) Thank you dev for all your support!!! This is such a pretty and fun game!