Looking for the Zeo app for iPhone

Hi All,
The Zeo app for iPhone is of course no longer available at the Apple app store. I thought I saw a link for it on this forum but haven’t found it yet. I did find the thread about using Zeo post Zeo’s going belly-up, so I’m interested in seeing whether I have all the components. This is a key one, however, so do let me know if there is a way I can get the app into an old iPhone of mine…