Limited edition GoldWave licenses are still available here.
In recent months, GoldWave has been removed from the Apple Store, Microsoft Store, and now (prematurely) Google Play. Without all of these different platforms to support, we can once again focus on GoldWave itself. We will put that wasted, duplicated effort into more productive things.
To any new developers just starting out, we strongly recommend avoiding the App Store paradigm. App Stores entrench control by a small number of very large corporations. They impose barriers between you and your customers. They direct all traffic to their websites, often highlighting competitors on your product's page. These drawbacks (along with many others) are profoundly detrimental to any small company's long term success.