Issue: After downloading the macOS High Sierra upgrade utility,when you run the installer to upgrade your Mac to macOS High Sierra you get this error saying – The Recovery Server Could not be Contacted.
The recovery Server could not be contacted error while trying to upgrade to macOS High Sierra
This becomes a common error almost every time apple releases a new version of macOS. 70% of the times this error happens due to overwhelming download requests to Apple server. When Apple releases a new version of macOS, a lot of users try to download the new macOS version at the same time. Apple servers become so busy processing the download request by them. So try to download again after an hour and see if that helps. But this time Apple implemented a new software delivery method for macOS High Sierra installer file.
In this new technique, when the download request is too high they won’t allow the download of full macOS High Sierra installer which is around 5.2GB in size rather they would deliver a stripped version of this installer which would be 19MB in size. And it further downloads the rest of the contents and installation files. The error The Recovery Server Could not be Contacted occurs only when the stripped version of installer is downloaded and run to install the macOS High Sierra. In this post we will help you fix this macOS High Sierra downloading and installation problems. If you can’t download even the stripped version of High Sierra then follow this guide steps by steps otherwise skip to step 2.
Read the full article for more information: https://lightspeedfix.com/recovery-server-could-not-be-contacted-error/