I installed PostgreSQL using PostgreSQL-9.5.12-1-win64-bigsql on a Windows 10 system. I installed as a local admin. The installation completed fine, although it failed earlier when I tried to install it as non-admin of the laptop.
When I launch pgAdmin, I don't see the default instance of the DB installed on my system. When I expand the Servers group it is empty. I went to services to make sure that the PostgreSQL service (PostgreSQL 9.5 Server) was running. I restarted the service too.
Thanks,
Chandru