Can't upgrade ADManager Plus v6.1 via windows server 2003

Can't upgrade ADManager Plus v6.1 via windows server 2003

Hi Everyone,
      I try to upgrade ADManager Plus build 5010 to v6.1 via windows server 2003 but i got error "The ppm file that you have specified is not compatible with this product" .
      How should i do next? Have any suggestion???

                  New to ADSelfService Plus?