Don't install the game. Mount the ISO or open it as a zip archive. Take out only the folder called nine. Now go to mikocon make an account and download the 2D crack at the bottom of the OP. replace nine.exe in the folder with the crack.
For anyone who'd like to install/crack, I wrote a blog to introduce the method. You can use google translate to translate the page and follow the steps.
https://blog.mmf.moe/post/9-nine-pkutil-reimplement/
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