Lost original disc.How do I Install?

Sorry if this is a basic question – I had to completely uninstall Cubase 6 due to numerous bugs which tech support was unable to help me with. When I reached for my Cubase 6 original disc package I noticed the install disc was gone… Must have left it abroad when I installed it on my laptop last year.

What’s my recourse? I could just drag the original files from my backup drive but the point was to reinstall from scratch. Fully registered of course, but no info by phone or on the Steinberg website, and no answer to my email to tech support.

Any help would be greatly appreciated. Thanks!