On legacy versions like iOS 9.3.5, many modern apps are no longer supported. Filza allows you to:

Select the version compatible with iOS 7-14 and tap Install followed by Confirm .

manually to bypass the App Store's limitations.

archives like .zip and .tar without needing third-party desktop tools. Prerequisites

Filza File Manager for iOS 9.3.5: Download and Installation Guide

Allow your device to restart its interface (respring) to finish the installation. Alternative: Sideloading (No Jailbreak)