after installation,I have chooses to manage license then I got this
huss191998 You need to run Rhino in administrator mode and your problem will be solved
B.
Take a look on this > https://help.rhinonature.com/licensing
huss191998 RN when managing license requires you to run Rhino as admin (right-click on Rhino icon) - getting trial license also. It is explained after download survey as well as on F4R, besides that you can always refer to the manual at https://help.rhinonature.com/licensing