Server 2003 Unable to run Unattendedcleint.exe

Server 2003 Unable to run Unattendedcleint.exe

Anyone else have the issue installing the unattended client? I downloaded from the ZOHO web add computer on the pc itself and the installer wont run.
I have tried it on 3 so far , same issue. One worked fine . All are Server 2003 service pack 2 or better. 
No issues with 2008 Server install
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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,