If you want to sideload your own legally obtained IPAs (e.g., open-source apps or old games you ripped from CDs), use or Sideloadly . These tools use your free Apple ID to sign apps for 7 days. No malware, no surprise certificates.
host thousands of files specifically sorted by their minimum required iOS version. Legacy iOS App Archive: ipa+library+ios+935+free
This is a gray area. Downloading cracked or modified IPAs is piracy. However, downloading for personal use—especially when the developer no longer supports iOS 9—is generally not pursued legally. If you want to sideload your own legally obtained IPAs (e
Log in with your Apple ID on a newer device (iOS 13+) and download the app you want. On your iOS 9.3.5 device, go to the App Store -> . ipa+library+ios+935+free