Using "Psiphon Pro mod APK" files is highly insecure, often leading to malware infections, spyware, and data theft, which completely negates the purpose of using a privacy-focused tool. These "cracked" versions are manipulated by unknown third parties to inject malicious code, making them a significant security risk compared to the official, safe app. For your security, it is highly recommended to download the official Psiphon Pro app directly from the Google Play Store or their official website.