Im using android
After downloading the game go to file manager and it should show "extract" when you click on the game ( the default file manager can do it but if not then download ZArchiver) after that you get 3 option, Install the apk and open it then give it permission to storage and then close the game after that go back to file manager and copy the "archive.rpa" file to the "Documents/Renpy_Saves/com.jestur.ripples/game" folder (create if does not exist)
Then enjoy the game.
Hope I helped :) Don't forget to follow Jestur so you can get notified about future updates