Thank you but this doesn't solve the issue :
npm install --save appdynamics@next
npmWARNengine appdynamics@4.2.0: wanted: {"node":">=0.8.0 <=5.3.0"} (current: {"node":"5.5.0","npm":"3.3.12"})
npmWARNengine appdynamics@4.2.0: wanted: {"node":">=0.8.0 <=5.3.0"} (current: {"node":"5.5.0","npm":"3.3.12"})
npmERR!fetch failedhttp://packages.appdynamics.com/npm/4.2.0.0/appdynamics-protobuf.tgz
npmWARNretry will retry, error on last attempt: Error: fetch failed with status code 403
npmERR!fetch failedhttp://packages.appdynamics.com/npm/4.2.0.0/appdynamics-zmq.tgz
npmWARNretry will retry, error on last attempt: Error: fetch failed with status code 403
npmERR!fetch failedhttp://packages.appdynamics.com/npm/4.2.0.0/appdynamics-native.tgz
npmWARNretry will retry, error on last attempt: Error: fetch failed with status code 403
npmERR!fetch failedhttp://packages.appdynamics.com/npm/4.2.0.0/appdynamics-native.tgz
npmWARNretry will retry, error on last attempt: Error: fetch failed with status code 403
npmERR!fetch failedhttp://packages.appdynamics.com/npm/4.2.0.0/appdynamics-zmq.tgz
npmWARNretry will retry, error on last attempt: Error: fetch failed with status code 403
npmERR!fetch failedhttp://packages.appdynamics.com/npm/4.2.0.0/appdynamics-protobuf.tgz
npmWARNretry will retry, error on last attempt: Error: fetch failed with status code 403