For adult version install trinoline_en_R18Patch_setup.exe. “By installing this patch on your PC to a directory of your choice, running the all ages base game will automatically find the files and convert itself to the adult version.”
“The change can be identified by the title bar of the game:”
All Ages version: “TRINOLINE (all ages)”
Adult version: “TRINOLINE (English)”
!!! An error message will pop up when you try to access the config menu after installing the adult patch. Just close it and continue playing.