i_lilsad this post is almost 3 years old, and that user hasn’t been online since 2 months after the post. You would’ve probably had more luck receiving a reply if you would’ve posted in the creator’s post since they were last online 25 days ago.
Anyway, the issue they were having was caused by the names of the files being different from the original. If you look at the beginning of the names of their image files, you’d notice that it starts with underscores (either singular _ or double __), but those underscores should be tildes instead (either singular ~ or double ~~).
Also, the folder from the installation instructions is outdated. Use the following guide instead: https://plutonium.pw/docs/modding/loading-textures/