Bionicle: The Game (2003) need help playing

[Shenanigan]

So I recently acquired the game files for the game shown in the title above. Not on two CDs, like it's supposed to be, but just files downloaded online. However, the game won't allow me to play after installation, saying I need to put disk 1 in. Is there a way to circumvent that, or do I have to move the files onto two CDs to play? Any help would be greatly appreciated (especially if it means I don't have to go out and buy blank CDs).