I can't install Cubase AI 5

I have a new computer, but the thing is it doesn’t take disks. That means I can’t install Cubase AI 5. I tried to download the software online, but apparently I need an already installed version of it to do so. Is there any way I can install the original Cubase AI 5 online without the disk, or do I have to get an external disk drive?

That’s what I did, got an external disk drive, handy to have around.