I thought 512 Mbyte is enough for an IIS web server on a Windows 2012 R2 with Update Server Core, so I choose that amout of memory and started up the VM to install the OS. But then, I got the following error: “Windows cannot find the Microsoft Software License Terms. Make sure the installation sources are valid and restart the installation.”
So firstly I checked the Hash value of the ISO but that wasn’t the problem. Furthermore I followed some guides from the internet with not choosing the ISO while setting up the VM and adding it afterwards (Parallels and VMware issues), but that wasn’t the solution either.
After some research I came to the conclusion that you need to assign a minimum of 576 Mbyte for the VM to bypass this error.