If you would like to try out minecaft indev, alpha, or beta, this is for you! There is a program which allows you to change the current minecraft version. This is called MVC or Minecraft Version Changer. Here is the link if you would like to change your minecraft and try out older versions! www.minecraftplaza.com/minecraft-version-changer/
Follow the instructions in the video on how to install the versions. I hope this helped!