If you're having trouble installing an app from the Google Play store, there are a few things you can try.
First, make sure you have a strong internet connection. If you're on a mobile data connection, try connecting to a Wi-Fi network and see if that fixes the issue.
If that doesn't help, try clearing the cache and data for the Play Store app. To do this, go to Settings > Apps > All > Google Play Store and tap "Clear data" and "Clear cache".
If that still doesn't fix the problem, you can try uninstalling and reinstalling the Play Store app. To do this, go to Settings > Apps > All > Google Play Store and tap "Uninstall updates". Once that's done, you can go back to the Play Store and download the app again.
If you're still having trouble, the best thing to do is contact the app developer directly and let them know about the problem you're having. They may be able to help you troubleshoot the issue.