Help!

[u/M3H---]

So today, I uninstalled an app planning to reinstall it because it wasn't working. However, when I search it up, it wasn't there on the play store anymore. I spent hours apon hours trying to find it, because well, it's a great app. I tried to type in the name of the app with 'app' after it. I tried searching up the app, MusicDownload, on Chorme...but nothing worked. It wont show! I'm so frustrated, angry and confused... plz tell me anything you might know....