Cannot Create or Modify pgpass.conf file in %APPDATA%\postgresql directory

So, I want to backup my database using the pgagent.

OS: Windows 10 (64 Bit)

I found out that pgagent is not installed in my environment.

So, I upgraded my pgAdmin to V4.3 and with that I am trying to install pgagent via Stackbuilder's edb_pgagent_pg13 option. The exe is downloaded on my system but when I install it, I get this error:

Then, I saw that there is no folder called postgresql in my APPDATA folder so I created one."C:\Users\Harshad\AppData\Roaming\postgresql" and then again run the edb_pgagent_pg13.exe

I am still getting the same error.

now, either I don't know how to create the pgpass.conf file or I dont know how to correctly create it.

These steps I followed are:

1. Creating the postgresql folder in my APPDATA folder
2. Running the edb_pgagent_pg13.exe as admin
3. Creating a blank pgpass.conf file in"C:\Users\Harshad\AppData\Roaming\postgresql"

On starting Stackbuilder again as an admin, I chose just the pgagent option but it gives me an error saying incorrect system username and password. It is required for the installation" When I did not get an option to enter credentials.

What should I be doing correctly to get pgagent which will allow me to create and schedule backup jobs?

Edit: Added OS information