Panzer Dragoon Saga

Has anyone tried playing a downloaded copy of Panzer Dragoon Saga on an actual Sega Saturn?

All four ISOs play fine on an emulator, but for me it seems that only the 1st and 4th disc will boot on the Saturn. The 2nd and 3rd cds won't work at all no matter where I download them from, or how I burn them...

Anyone else have the same problem?