Technical Tick Are you trying to install mac OS High Sierra from Internet Recivery and are getting this error "The Recovery Server Could Not Be Contacted" ??? So This Video Will Show you how to fix this error. Command Used in this Video: nvram IASUCatalogURL=" Paste the link here " You can easily fix this error. After Watching this Video You will be able to install MacOS High Sierra on Your iMac or Macbook Like this Video and Share to help other users of old iMac and Macbook. Thanks for Watching!! Be sure to hit SUBSCRIBE For More Videos.