If not, it should be a matter of finding the game in your steam library, right clicking on it and going into Manage -> Browse local files. Then open the "game" folder and copy the .rpa file into that folder. The game needs to be restarted after that (if it's currently running).
Also, make sure you downloaded the patch from -need-love-too/index.html
If you downloaded it from somewhere else, it's possible that it's an old version of the patch made for a previous version of the game.
It appears to be in the right place. The only possibility I can see would be if you started playing the game without the H patch, it save on quit, now it's automatically loading that save (without the H patch applied) and not checking again.
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