Until a week ago, I was happily running macOS Server 5.3.6 on High Sierra.
My hard drive failed, resulting in an eternal beachball instead of restarting. So, I put a clean copy of High Sierra 10.13.6 on an external and rebooted from the new/external startup disk.
Problem: Neither Server.app, nor the /Library/Server/ directory are present on the clean install.
I need to install Server 5.3.6, the last Server version with support for websites and IMAP mail.
48 hours later I am still searching.
Where can I find a copy of the Server 5.3.6 installer?
Or, should I simply erase the drive and install macOS Sierra [or a given prior macOS version]?