Because these files are fan-made, they aren't hosted on mainstream sites like Amazon. You usually have to look in specific community hubs:
When searching for files with specific extensions like .epub , be careful of "spam" sites that ask you to complete surveys or download .exe files. A legitimate English patch should only be a few megabytes and should never require you to install software to "unlock" the text. Harem In Maze 2 English Patch.epub
Use apps like Moon+ Reader or Lithium . Just download the file and "Import" it into the app. Because these files are fan-made, they aren't hosted