ugrading to new PC win 8.1

I have a Lexicon Alpha which came with a DVD-ROM of Cubase LE5 and a serial number.
I am looking to upgrade to a windows 8.1 laptop without a disc drive so can’t install Cubase. I was wondering if there was any way I could download the software instead?

Time to call upon a friend who has a DVD drive, and copy the program folder to a USB stick, from which you can install it.

You can install Windows 8.1 using Pen Drive or Flash drive rather than disk drive.