pgAgent service for PostgreSQL does not run

OS: Windows 10 PostgreSQL 11.4 I Installed PgAgent with Stackbuilder setup. In Windows services; PostgreServer service is running. However, the pgAgent service is stopped. When I try to start pgAdmin service from there I get this error message:

The PostgreSQL Scheduling Agent - pgAgent service on Local Computer started and then stopped. 
Some services stop automatically if they are not in use by other services or programs.

I have the pgAgent service to log On As -->LocalSystem (Note, I have also tried to change it to an windows administrator account) When opening pgAdmin 4 I can see the pgAgent Jobs tab as well as create jobs. Acording to the description on this page ,one should create an extension as well. However, when pgAgent was installed , there wasen't copied any extension files to %\PostgreSQL\11\share\extension so I can not create the extension in pgAdmin Any advice on how I get the pgAgent service to run my jobs I have createn in pg Admin? ---------- **EDIT:** On This thread They state that editing pgpass.conf in c:/user/user/AppData/postgresql helped. I have no such folder nore file. The only postgres related folders I've found under C:\Users is C:\Users\user\AppData\Roaming\pgAdmin ---------- **EDIT2:** * I opened CMD as an admin and run cd %APPDATA% to find correct folder. * I created the pgpass.conf inside newly created folder postgresql in appdata --> C:\Users\user\AppData\Roaming\postgresql\pgpass.conf. * I added that file as a system variable PGPASSFILE (Source1 and Source2 ). That did not change anything either. Cholud I do some editting in REDEDIT? Source3 ----------