A sideloading tool like AltStore, Sideloadly, or Cydia Impactor. Step-by-Step Installation:
Installing an IPA file is different from downloading an app from the App Store. Since these apps aren't "authorized" by Apple, you’ll need a sideloading tool. Prerequisites: A computer (Windows or Mac).
What platform are you posting this on? (Reddit, Instagram, Twitter, etc.) Do you already have a download link you want to include?
To install and use a "Display Recorder" IPA, you generally need to the file using a computer or have a jailbroken