Basic License:

To be allowed to upgrade to the latest Windows operating system version, an older or less extensive Windows version must be owned. We believe that buying a cheap Windows 7 OEM license (ebay, other online stores) is sufficient to prove possession of a so-called Basic License.

Activation through KMS server:

The Key Management Service (KMS) operated by the computing center of the CAU is a form of copy protection. To activate Microsoft Windows and Microsoft Office, please go to the website of the computing center and choose the appropriate program in the left navigation menu and follow the steps under "Manuelle Aktivierung". KMS website computing center CAU (Rechenzentrum) in german