How to get DeployGate Client's APK file or Can I install DeployGate Client without Google Play?

Yes. You can download and install DeployGate client to your device directly from here:

Google Play and Play Services are not needed. 
This is useful for all android based system like Kindle.

Apps' update notifications are sent via Google Play, so if you do not have Google Play installed the update notification will not work. But every time when you open the DeployGate App you can always easily find out the update version info. 

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