Each product of ERA Bundle is an audio plug-in effect, which means that you cannot find them in your Applications folder and launch them like a standalone application.
Instead, you need an audio plug-in host, like an Audio Editor or Video Editor to open and use the plug-ins.
I don’t have an Audio/Video Editor! Could you recommend one that would be compatible?
There is a list of all the compatible plug-in Video/Audio Editors and Operating Systems in the Compatible Audio and Video Editors with ERA plug-ins section of our Help Centre
You can also find additional information, for example about the installation procedure or how to load a plug-in in a supported Audio/Video Editor, in the How to open ERA plugins in your Audio or Video Editor section of our Help Centre.