Cydia Impactor was the classic sideloading tool, but Apple revoked its certificates. However, on iOS 9.3.5, you can use an with a free Apple ID. Steps:
: Generally remains usable, though it may experience occasional lag. Puffin Browser ipa apps ios 935
If a site promises "unlimited coins" or "hacked" versions of paid apps with no verification, it is likely malware. Cydia Impactor was the classic sideloading tool, but
: Install it on your computer and connect your device via USB. Obtain the IPA but Apple revoked its certificates. However
Disclaimer: Sideloading copyrighted IPAs may violate Apple’s ToS or local laws. This guide is for educational purposes and legacy device preservation. Always support developers when possible.