At the following link you find the files you need to install the windows version you purchased.
Using the following Microsoft software you can create a USB device or a DVD for installation purpose: http://wudt.codeplex.com
After or while installing you will be asked for your bought license key.
It is an AIO version of the iso file. You dont need to choose you purchased version until starting the installation process (see screenshot below).
Problems while activation
If you experience trouble while activating your license, please use the automated telephone system offered by Microsoft .