Not sure if it is the correct way as it is uncensored for me, but with kind of bad textured lady-parts (though i have not downloaded any large data, so i am on low-res). I have v138. I used a fresh download of the game (no other patches or things installed).
I also have an AMD. It also first did not work for me, because i did not have the uncensor-dll in the plugins-folder.
I downloaded:
BepInEx-Unity.IL2CPP-win-x64-6.0.0-be.670+42a6727.zip ~33MB
and
Uncensor_for_ricca_net6_v1.0.1.0.zip ~10kb the 69MB file has the corrected textures for the uncensored lady-parts. These files need to go into the plugin-folder inside the BepInEx-Folder.
from this post:
https://f95zone.to/threads/the-fair...-sisters-v1-3-8-mogurasoft.89059/post-8620267
Within the "game" directory a folder named "BepInEx" has to exist (same as "dotnet" and "HolyknightRicca_data"). Inside the BebInEx various folders exists, some with dlls. In the "plugins"-folder, a dll named "Uncensor_for_ricca_net6.dll" needs to exist.
And with this, nothing else needs to be done. Just start the game.
Then from there, you propably can somehow apply some high-res-stuff?