Before attempting any complex fixes, verify the following basics:
The Error: The application has failed to start because its side-by-side configuration is incorrect. eternity audio tool download fix
The Fix: This indicates a corrupt or missing Visual C++ runtime or a manifest issue within the executable. End-to-end manual tests on iOS/Android/desktop
The #1 complaint about the Eternity Audio Tool is dead links (Rapidgator, Uploaded, Zippyshare which is defunct). Here is where to look today for a clean copy. Before attempting any complex fixes, verify the following
If you have already downloaded the installer or portable version and it refuses to launch, follow this hierarchy of fixes.