Why don't I see an upgrade button on Android?

Sometimes Google Play does not identify a device as eligible for in-app purchases.

Please try the following steps:

• Force stop the app and re-launch.
• Ensure your device has automatic date, time, and timezone enabled.
• Ensure your Google Play account that you used to download TezLab includes a valid payment method.
  • Google Play remembers the Google Account that was active at the time that the app was downloaded. If you have applied a payment method to a different Google Play account, you may need to re-download TezLab from the Google Play Store while ensuring that the correct Google Account is active.

If that still does not work:

• Uninstall TezLab, restart your device while uninstalled, and then re-install TezLab.

You can also check out this Google Support article on this topic.

Sorry for the inconvenience, and we appreciate your support.