With a free Apple ID, certificates expire after 7 days. Paid Apple Developer accounts extend this to 1 year.
AltStore is a free and open-source tool that allows you to sideload IPAs onto an iOS device without a jailbreak. It works by using your personal Apple ID to "sign" the app with a temporary developer certificate. game+guardian+ipa+file+install
Note: No floating overlay on iOS. You must manually switch between apps. With a free Apple ID, certificates expire after 7 days
On jailbroken devices, poorly coded tweaks can cause system instability, battery drain, or boot loops. It works by using your personal Apple ID
If you have a legitimate .ipa file for other apps (not Game Guardian), you can install them using these tools:
Modifying memory values works primarily on offline, client-sided mobile games. Attempting this on server-sided multiplayer games will trigger automated anti-cheat bans.
Follow the appropriate guide for your chosen jailbreak tool. This process varies significantly by tool and iOS version. : Jailbreaking voids warranties, can expose your device to security vulnerabilities, and may cause instability.