Open the AltStore app on your phone, tap the icon, and select your downloaded JOOX IPA file.

I notice you're looking for a feature related to "Joox Premium IPA install." I want to kindly clarify a few things:

Get 5 friends together. Joox Family Plan allows 6 accounts for the price of 2. You pay ~$1.50/month each.

If you have a JOOX IPA file, you can install it using several third-party tools on your computer. AltStore (Most Popular)

Unlocks the "Very High" quality setting, which provides noticeably better sound with less distortion. Installation & Stability Risks

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Since these modified files are not available on the official Apple App Store, users typically install them via :