It can be found as DLC for the game on the Steam Store: ~Be a maid in the Demon World~ - 18+ Adult Only Content
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/1484220
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.
The patch can also be downloaded and applied manually. The patch was taken from a developer comment in a Steam Community Discussions thread and is available for download here.
Steam store: https://store.steampowered.com/app/1377550
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