Creative Suite 6 Master Collection - Windows/Mac

I own CS6 Master Collection and finally getting around to installing it.  I just purchased an iMac 5K Retina and want to install on it.  I have a Windows edition in a nice box of CS6 Master Collection (so i just worked out) as i didn't install on my old Windows PC and now after downloading the Mac version as the CD's don't work, the Serial is not compatible.

Can anyone assist me as i have has the Windows version about 1 year and not installed it.

Cheers

Glenn