It can be found as DLC for the game on the Steam Store: Hentai DLC for Elemental Girls
If the Steam Store page isn't working, you may be able to install it by either clicking the following command or running it directly on your PC: steam://run/1079920
Note that this will immediately run the game and start downloading the DLC if possible - you may need to close the game and wait until the DLC finishes downloading for the patch to work.
Steam store: https://store.steampowered.com/app/1079310
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