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First, How do I know that an Avaz update is released?

it is good practice to keep your app always updated with the latest version. Updating the app gives you access to the latest features and improves app security and stability.

You can update the app either manually or automatically. 

Update Avaz app manually

1. Open the Google Play Store app .
2. Tap Menu  My apps & games.
3. Apps with an update available are labeled "Update."
4. Find Avaz app and tap Update.

Update Avaz automatically

To set up automatic updates for Avaz:

1. Open the Google Play Store app .
2. Tap Menu  My apps & games.
3. Select Avaz app.
4. Tap More .
5. Check the box next to "Enable auto update."

Avaz will update automatically when updates are available. To turn off automatic updates, uncheck the box.

Update Android apps automatically

To automatically update all apps on your Android device:

1. Open the Google Play Store app .
2. Tap Menu  Settings.
3. Tap Auto-update apps.
4. Select an option:
   • Auto update apps at any time to update apps using either Wi-Fi or mobile data.
   • Auto-update apps over Wi-Fi only to update apps only when connected to Wi-Fi.

Note: If an account on your device has a sign-in error, apps may not update automatically. 

Courtesy: Google Play Help: How to update Android apps