why demo is displayed?

You need to be a lot more specific and provide a lot more info , including computer type used and OS type and version and version numbers of all software related !

Otherwise , here is the link to a support article if this is your problem ! : My Products Are Showing As DEMO in Native Access  : https://support.native-instruments.com/hc/en-us/articles/4402377887121-My-Products-Are-Showing-As-DEMO-in-Native-Access