Download the Real Play HF Patch.
Read the patch release post while downloading, so you know what is required and what to expect!
Run the patch by double-clicking on the file you just downloaded.
Read the information in the beginning and make sure that you have enough free disk space to run the patch before you click Next!
Click Next and review the components. The Recommended installation is all you need to get the game updated, partially translated and uncensored, but you might want to check out the options anyway.
Click Next and consider installing an icon on your desktop (TIP: The shortcut using AppLocale is highly recommended, because you still have to run the translated game with Japanese locale. Using the shortcut will make it completely transparent that you actually run the game with Japanese locale!).
Click Next to start patching your game. Beware that patching your game will change installed files and it cannot be reversed or uninstalled. Therefore you should keep the original files, so you can restore the game to it's original state later on if needed. Having the original files might be a necessity if you plan to install additional or different mods later on.
Let the patch finish. Patching may take several minutes and the progress bar may not move. Just be patient. It is guaranteed to work if you installed the game as outlined above.
Play the updated, partially translated and uncensored game by double-clicking the desktop icon. :)