One thing that is important: All library parts have to be downloaded one at a time, not simultaniously. Otherwise the content can get messed up. I reinstalled everything as I did not think of this setting up my new computer.
What exactly happens when you call up a kit within the gui? The license thing is a bit strange, good advice above to keep yourself a copy. Support did not answer my question about this, so I took a copy from my old pc and that did it. Don't know what happens when the file is gone. I think that would simply be bad luck. Keep us informed, we'll get this baby running.