Group Member - Accepting Team Project Invitations
As long as the Creative Cloud Application is running you should receive invite prompts via Windows Notifications and via the Bell Icon in the Creative Cloud Application
Accept the two invitations from your Group Member by clicking Accept on the prompt (One for the Team Project, another for the Shared Media)
In Windows Explorer, 
you should now be able to see a folder with the name of your shared Team Project in Creative Cloud Files
Next Steps...