The section where you go to the Party, it asks if you want Sandbox, or normal. When I choose Sandbox the game wont progress, it just sets there. Nothing happens. I click and click, nothing. If I choose normal, the game will progress.
EDIT: I figured it out. The images were named wrong, so either the dev did it, or
KoGa3's mod did it. They were .png's and the game wants .webp. So, I copied that entire folder and renamed them .webp. Put them in the folder so that both the .png and .webp images are in there (just in case it still wants .png down the road), and now the game works.
To anyone else with this error, attached is a file to download and place in there yourself. Extract the folder and it goes in game\images\party and you will be overwriting the imagebuttons folder.