The "Shortcut IPA Installer" isn't a single app found on the App Store. Instead, it is usually a set of automation scripts created by the community.
A full shortcut guide for Installing .ipa files on iPhone and iPad shortcut ipa installer
You need an IPA to install. Use Safari to download an IPA file (e.g., a retro game emulator or a modified YouTube client). Save it to the folder in iCloud Drive or your "Downloads" folder. The "Shortcut IPA Installer" isn't a single app
a download link that triggers the iOS "Install" pop-up directly on the device. Popular Sideloading Methods (2025-2026) shortcut ipa installer