This game's exe type is IL2CPP. so you must use IL2CPP type BepinEx.
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Current downloads are
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BepInEx Unity IL2CPP for Windows x64 games
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BepInEx Unity IL2CPP for Windows x86 games
Try one of above. You may have an x64 version.
Extract file to Game folder(where Demon Sword Incubus.exe file exists).
Ruin once. May be takes some time. (First run only)
Quit game. BepInEx\plugins folder is created by BepInEx. Not created ? Try another BepInEx ver.
Extract uncensor plugin file to BepInEx\plugins folder. That's all.
If don't works, check is there any unicode characters in game path ? (ex. "c:\게임\Demon Sword\")