I just installed a fresh new install of PostgreSQL-10.5-1-win64-bigsql
Once installed I wanted to add the PostGIS extension ran: CREATE EXTENSION postgis;
Got error message could not find C:\PostgreSQL\pg10\share\postgresql\extension\postgis.control
I found the file at this location C:\PostgreSQL\pg10\share\extension\
So I thought I could just copy the postgis.control into the directory where it was being looked for and ran the create extension and got this: ERROR: extension "postgis" has no installation script nor update path for version "2.4.4"