Which are you currently using (Palera1n, Dopamine, etc.)? What device model are you on? Are you getting a specific error code during installation?
Installing iGameGuardian on iOS 16 requires a few extra steps compared to earlier versions of iOS. Here's a step-by-step guide: igameguardian ios 16
Instead of wasting time on dead software, pivot to working methods: Which are you currently using (Palera1n, Dopamine, etc