There had been some questions about ARD Hub Admin capabilities, on whether flows, projects, folders, and or versions can be role base restricted.
 

Does ARD Hub Admin have the capability to restrict Project | Version | Folder | Flow access ?

ARD 2.9
ARD 2.10

No - this feature will be available in an upcoming release, however it is not currently available.
 

Video URL on how to open a Support Case - https://communities.ca.com/videos/5898-demo-how-to-open-a-support-case
You can download the latest version of TDM by following the directions in this document: https://support.ca.com/us/knowledge-base-articles.TEC1903942.html.   
To contact support, go to https://www.ca.com/us/services-support/ca-support/contact-support.html.