Lost Cubase AI 4 Disc

Hello, I bought an MG166CX-USB mixing console back in 2009, and was digging it out to use for some mixing when i realized that i dont have the cubase ai 4 disc anymore. Does an ISO exist for this software, and if so, how can i download it. I registered the software through e-liscenser so that is still available if you need proof of purchase. Thanks!