So, what did you actually get in an old version? Let's break down the core functionality that made v4 (circa 2016-2018) a legend:
Older software versions may lack modern low-latency API optimizations like AAudio or Oboe. To fix sync issues: Open the menu within the app. audio evolution mobile studio old version
Ensure you are signed into the exact app store account used for the original purchase. Tap inside the app shop panel. So, what did you actually get in an old version