Yesterday (06. 06.) I actualized Win 10 and I was not able to use Photoscan, because it needed to activate. After inserting the licence key, Photoscan showed that the activation was succesfull but the application was still in demo mode. So I downgraded my windows to previous version and everything worked fine, without the need of activation. So, I think, there could be some issue with Photoscan and new Win 10 compatibility