This guide shows R18 Patch and the best graphics options for Nekopara Vol. 4.
The official patch is on the English version of the page DLsite.
You have to download the rar files, put them in the same folder and unzip them at the same time, then you start the installer and install it in the game’s location. Once you start the game, you have to select this option.
It is accessed of the next way:
Once you select that option, you return to the same place, and a list of performance and graphics options will appear.