It can be found as DLC for the game on the Steam Store: Highway Blossoms - 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/943720
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 is now available through the official Steam DLC - only use the method listed below if this is unavailable to you for some reason.
The patch link below is the developer's link, taken from the Highway Blossoms website. If there are any issues with this link, please let me know on the Contact page.
Adding the adult patch is likely to break any pre-existing saves, so don't install this if you're part way through a playthrough you care about!
Patch link was last updated for the Remastered Release.
Patch download: http://highwayblossoms.com/hbadult/adult.rpa
Steam store: https://store.steampowered.com/app/451760
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