(Play Store Version will be available soon)
This version is safe to install. You will see a Install blocked message which will only be shown on Beta.
The message will read: For security reasons, your device is currently set to block installation of applications not obtained form Play Store. To change this, go to Settings, Security, Unknown source.
This is what you do:
When you see this message, tap Settings and tap the unchecked box for Unknown sources, Tap Ok and tap Install tap Open.