Traditionally, an (iOS App Store Package) is the file format used to install apps on iOS devices, similar to an APK on Android. In the past, "Aptoide IPA" searches were mostly associated with unauthorized jailbreak tweaks or unstable third-party installers.
The real challenge began with installation. Since this wasn't an official app, Leo had to use side-loading tools. He connected his iPhone to his laptop, opened AltStore (a popular tool for installing IPAs), and held his breath as the progress bar crawled forward. aptoide ipa