It is possible the message could be displayed as a side effect of some other issue.
Please go to Toolset > Settings and follow the "Toolset Debug Information and Troubleshooting" link at the bottom, and from the resulting page follow the "Installer Support" link (or access the page directly at site.com/wp-admin/admin.php?page=otgs-installer-support).
That shows some diagnostic tests relating to the installer attempts to communicate with our servers, including a log of possible issues.
Does it report any problems?
If WP Engine support say that they can see PHP errors, what are they?
Can you check your debug logs for errors?
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