If you are interested in iOS app modding for educational purposes only , explore sideloading open-source apps (like uYou+ for YouTube) on a non-primary, non-jailbroken device with no personal data.
If you still choose to explore mods (not recommended), watch for red flags:
Finding and downloading a "Modded" Apple Music IPA is often sought by users looking to access premium features like ad-free listening or offline downloads without a subscription. However, users should be aware of the security risks and legal implications associated with modified applications. Understanding Apple Music "Mods"
: On your iPhone, download the IPA file. Open the AltStore app, go to the My Apps tab, and tap the + icon.