I am upgrading an older server. It was running Mavericks (10.9) and just upgraded to Yosemite (10.10). However, when I try to upgrade the Server app, the only option I have is the new macOS Server, which won't install on my OS.
I've searched the web for hours looking for a legitimate way to buy and/or download this software, but there appears to be no way to do it.
As I never bought the app, it doesn't appear in my Purchases list in the App Store.
Does any one know how I can get OS X Server 4?