Due to certificate revokes by Apple and the age of the firmware, many modern libraries do not work. Here are the ones historically compatible with iOS 9.3.5:
You cannot just download an IPA from a random forum and drag it into iTunes 12.6.5 (the last version that supports App Store management). ipa library ios 935
: A searchable database of over 100,000 links to IPAs across various iOS versions. Due to certificate revokes by Apple and the
This is one of the most comprehensive archives of legacy IPA files , featuring over 17,000 decrypted apps specifically sorted by their minimum iOS requirements. featuring over 17
When using third-party installers, it is highly recommended to use a "Burner" Apple ID