PCSX2 1.7.0 is not merely an incremental update; it is a paradigm shift. The development team moved from the old wxWidgets interface to a modern Qt framework. This new version dropped support for very old plugins (like ZeroGS and SPU2ghz) and mandated a more organized folder structure.
The team behind PCSX2 is strictly against piracy. They developed the software with the intent that users would "dump" the BIOS from their own, physical PlayStation 2 consoles. Because of this, you will never find a legitimate link to download a BIOS on the official PCSX2 website, forums, or Discord server. pcsx2 1.7.0 bios download