Erro 21 on adobe xd (help me)

Thanks, Halo.  You will need to complete the instructions in the error message and apply the missing updates to Windows 10 if you wish to continue using Adobe XD on this computer.

Halo, what operating system are you attempting to install Adobe XD on?  Please make sure that you are installing on a device that meets or exceeds the system requirements listed in https://helpx.adobe.com/xd/system-requirements.html.