Dumb! 1 star for you!
As soon as I installed and used it the first time, audio didn't work and I just get a stupid popup when I click the play button that says, "To hide a backlink please purchase a GSpeech PRO version." So, it doesn't even work, and yet and they're already trying to sell me an upgrade? Brilliant!
My suggestion is to hide overt marketing like that. There are much better and far more subtle and effective ways to promote your plugin upgrade. You're doing it wrong.
I'm deactivating and uninstalling GSpeech plugin NOW.