This site offers the legacy Ivona Eric voice for desktop use, specifically for Windows SAPI 5 compatibility. You can find the Eric Ivona Voice download here, which often includes a 30-day trial.
For creators looking for the specific "GoAnimate" style, Fish Audio's Eric AI Generator offers a version modeled after the 2016 Ivona 2 engine. Key Features of the Eric Voice ivona eric text to speech link
Ivona Eric: How to Find and Use the Classic Text-to-Speech Voice This site offers the legacy Ivona Eric voice
Because Amazon acquired Ivona Software in 2013, the official way to access this technology has shifted. Depending on your needs, you can find Eric through the following links: ivona eric text to speech link