MID Server's agent log (./agent/logs/agent0.log.0) may show the Install Name as "Demo Server", which is confusing and probably wrong for your instance.
10/24/19 11:00:03 (398) MIDServer MID Server started
10/24/19 11:00:07 (284) StartupSequencer Successfully connected to instance:
10/24/19 11:00:07 (284) StartupSequencer Install name: Demo Server
This is nothing to worry about. Our instance provisioning scripts use "Demo Server" as a default value for all instances. You will also see that value at the top of the /stats.do page.
If you prefer some other value, then you can change the system property that defines the text:
This will have no functional effect at all for the instance, so can safely be changed to anything.