Newer versions typically add new story chapters, refined character sprites, and additional "lewd" or "story-heavy" scenes depending on your path.
Because choice consequences can be delayed, it is recommended to keep multiple save slots at the start of each new "Day" or major chapter.
Install JoiPlay and its from the Google Play Store.
Run the .exe file (for Windows) or the corresponding executable for your OS. Download the PC version of the game.