Refer to this post fromMiniTooland you’re able to find much information about Postgres download & installation.
Lets look at it.
Originally, it was called POSTGRES.

In 1996, it was renamed as PostgreSQL to indicate its SQL support.
Later, the team keeps the name PostgreSQL and the alias Postgres.
Postgres is available on many platforms including macOS, Windows, Linux, BSD, and Solaris.

How do I download PostgreSQL?
PostgreSQL/Postgres is free, with no fee even for use in commercial software products.
Step 2: There are multiple PostgreSQL downloads for various platforms.

To download Postgres for Windows, click theWindowsicon to enter a new page.
If you are using other systems, opt for corresponding icon and download PostgreSQL.
For Windows, the download file is a .exe file.
In terms of Postgres download Mac, you might nudge the download icon to get a .dmg file.
In this part, we mainly focus on the installation on your Windows PC.
Step 1: Double-press the .exe file and clickNext.
Step 2: Specify an installation directory and go on by clickingNext.
Step 3: Choose the components you want to install.
Step 4: Choose a directory under which to store your data.
Step 5: Enter a password for the database superuser.
Step 6: Enter a port number the PostgreSQL database server will listen on.
Step 7: Choose the locale to be used by the new database cluster.
To install PostgreSQL on Mac, double-pick the .dmg file and start the installation by following the on-screen instructions.
The steps are similar to the ones in Windows.
Just follow the given guide to get this database service if you need it.