The second one does not have the bios files which can be easily accessed online and pasted into the bios files in the PCSX2 folder. Hence, after you click to download PCSX2, one window displays two options- PCSX2 Windows Binary or the standalone installer. However, I recommend having at least two versions of PCSX2 an official one and one that is in development. The new version is known as PCSX2 1.6.0, however, you can always download earlier versions. You will find one which is compatible with your system as PCSX2 has several versions. Mac, Linux, and Windows are compatible with PCSX2. The moment you press the tab, a new window pops displaying your preferred version. You can download PCSX2 from ps2 bios download by clicking on download get PCSX2 here.
