This mod is only compatible with Undertale v1.08

To apply the patch to the game, you need to find the internal files of Undertale. If you don't know where that is, you can open Undertale, open Task Manager, right click on Undertale in Task Manager, and then click "Open File Location" to find the internal files.

Next, you need to open Delta Patcher and apply the patch to Undertale's data.win. (make sure to have a backup of the vanilla data.win!) That's it!