Google has recently pushed out an update for its Text-to-Speech app to the Google Play Store, but the changelog reveals that Google has been actually removing some features.
Rather than adding in a host of new tools, Google has decided to remove the option to download high quality voices from within the app. However, there is a positive reason for this, the high quality packs have been made obsolete. Google has updated the standard quality voice packs so that they are now of a superior quality to the old high quality packs. To quote the update notes:
Our standard quality voices now surpass the quality of the high quality voices from our previous release
Good news then. The latest update to Text-to-Speech also brings additional support for Indonesian and Hindi languages.
If voice quality was off-putting in the past, now might be a good time to give it another shot. You can force update Text-to-Speech from the Play Store, if an automatic update has not already come through.