Hey if you're on Android what you have to do is download it from the site, then when it's finished it'll come in the form of an APK (I don't really know what an APK is) then you have to go to your files locate it it downloads and then install from there. After it installs it'll pop up like any other app, hope this helps if not then just let me know.
(I'm not the creator just a person trying to to help)