Maybe the answer is three posts above my question ? I have activated my system via the 16278 -> 17134 route on a new partition and got the digital license (HWID). My main system on the same machine is a Pro install (digital license). Can I now switch this Pro (1809) to WS via entering a new serial to keep all my data and will I it be activated because of the digital license from the first step? Which serial do I need to switch editions? Thanks a lot and sorry when this was answered already several times, didn't find an answer in the last pages, there was always KMS involved it seems.