To install:
On a fresh copy of undertale V1.0.8 use Delta Patcher to apply the provided patch onto data.win in your undertale folder
And copy and paste the splat sound effect into the same folder

Additional save files:
I have included two file 0 save files which will take you to the Undyne the Undying fight and the Sans fight. To use them replace the file0 in your savefiles with these, and make sure to rename them file0. (You might want to make a copy of your old file0 so you don't lose
your progress)