To run macOS Server 5.6.3, your hardware must meet the following criteria:
macOS Server 5.6.3 is the final stable version of the Apple Server application designed specifically for . It serves as a transitional release, marking the beginning of Apple's shift away from a full-featured server suite toward a tool focused primarily on Mobile Device Management (MDM) and storage. Core System Requirements Server MacOS 5.6.3
: Requires macOS 10.13.5 or later . While it can be installed on 10.14.0, it will operate with a significantly reduced feature set. To run macOS Server 5
: At least 14.3GB of available space is recommended for a full upgrade. The "Spring 2018" Transition Does 5.6.3 delete deprecated services? - Apple Community While it can be installed on 10
: Restricted to Mac models that natively support macOS 10.13 High Sierra. Memory : Minimum 2GB RAM .