AltStore is a sideloading tool for iOS that lets users install .ipa files (iOS app packages) without using the App Store. It works by signing apps with a developer certificate linked to your Apple ID and requires periodic re-signing to keep the app valid.

If you encounter any issues during the installation process, here are some troubleshooting tips:

: AltStore will begin sideloading the app. If prompted, enter your Apple ID and password to sign the app certificate. Wait for Completion

There are several reasons why you might want to use AltStore to install IPA files:

Download the macOS version of AltServer from the AltStore website.