Deployment via Distributor , Native Tool and GPO Not Working

I have tried all 3 options to deploy the unattended access to a network of about 70 Machines. If i add it as a GPO Nothing happens. The Distributor and the native tool will validate with the server but then i get this error "Installation failed: The RPC server is unavailable." Out of 70 machines only 1 machine installed. Please provide assistance with one of the 3 options. Thanks.

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Release Notes: Version 1.91, February 2015
Unattended Access (Beta) is live! Unattended Access, a feature requested by a lot of our customers is live now. Currently, it's in beta. You can add up to 100 computers per Technician subscription. They can also be accessed by your organization members. My Computers list in Zoho Assist home page will always display the online status of your unattended computers. You can rename the computers whenever you wish. Currently, Unattended Access can be configured only for Windows computers. Nevertheless,