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If you see websites offering a "ZArchiver IPA" download, proceed with extreme caution. These are often: Never disable your iPhone's security settings or "trust"
If you need ZArchiver-level power, these verified apps are your best bet: Excellent for password-protected ZIP and RAR files. How to Manage Archives on iOS Without ZArchiver
An on-device installer often used by the enthusiast community. Can you extract an IPA?