While trying to install XD, Creative Cloud launches automatically and under Apps tab the message appears: "You don't have access to manage apps. Permission from your IT administrator may be required to enable apps management."
I am sorry for the delay in response. It looks like you are on an enterprise team license. If yes, then I would request you to please create a case, or initiate a chat from the Admin Console's support tab if you're a System or Support administrator using this link: https://helpx.adobe.com/contact/enterprise-support.cc.html If not, then contact your admin and ask them to create a case or start chat through the admin console.
Let me know if you need further assistance. I would be happy to help.