First, check to make sure you're downloading the latest version. Head to the Google Play Store, and if the PotK app page says "Update", go ahead and update your app.
If you're having problems downloading:
- Switch your browser to Chrome.
- Delete the browser cache and refresh your webpage.
- Go to Settings > Application > Google Play Store.
- Delete the Google Play Store cache and refresh the page.
- Try tapping "Update" again from the PotK app page.
Still having issues? Please comment below!