*The Early Access Program is now closed.
For current members of the program: once a version is available for early access:
Android users need to visit https://play.google.com/apps/testing/io.getdelta.android while logged in from Google Play email and confirm that they are a beta tester or accept to become one if they are not. You will then receive the early access version when it is available via the Playstore (it will download and install automatically if you have auto-updates enabled).
iOS users will be able to download the latest build through the TestFlight app.