If you find Shortcuts too buggy or unsafe, use these standalone installers:
A fringe alternative: convert an IPA into a .mobileconfig profile and have Shortcuts open that URL. Safari will prompt profile installation, which can install simple in-house apps.
Why this isn’t mainstream:
Enterprise certificates are issued by Apple to companies for internal app distribution. Leaked or abused enterprise certificates allow developers to sign IPAs. A Shortcut IPA Installer will redirect you to a webpage that forces an "Enterprise Profile" installation. Once you trust the profile in Settings, the Shortcut triggers the installation of the IPA via a direct link.
If your Shortcut IPA Installer fails, here are the most common fixes. shortcut ipa installer
Error: "Invalid IPA structure"
Error: "This shortcut cannot be opened because it is not trusted" If you find Shortcuts too buggy or unsafe,
Error: "Unable to Download App" (White/gray icon stays gray)
The shortcut asks for "Sign in to GitHub/Gist" Error: "This shortcut cannot be opened because it