IPATool (via GitHub) and a sideloading tool like iMazing . The Process:

Run the download command in your terminal to grab the official, encrypted IPA file from Apple's servers.

If you aren't comfortable with command lines, third-party "stores" can automate the process.

If you have a very old iPhone or iPad (like an iPad 2 or iPhone 6), the official App Store often has a hidden safety net. This method works only if you have downloaded Duolingo on your Apple ID in the past.

If your device is too old for the current version, a popup will appear: "Download an older version of this app?" Tap . Method 2: The "Duolingo for Schools" Workaround

from your current device if it's already there.

Use IPATool on your PC/Mac to search for Duolingo's bundle ID ( com.duolingo.Duolingo ).