Oracle client 19c is an application which has full ability to connect to Oracle database server, but it requires to be installed and registered with Windows platform. That's the biggest difference from Oracle instant client.
Here are steps to install Oracle client.
Download Oracle Client 19c for Windows
Here we use WINDOWS.X64_193000_client.zip from Oracle Database 19c Download for Microsoft Windows x64 (64-bit).
Please note that, the web page contains not only client packages, but also a lot of database server ones. You need to find the right one by pressing Ctrl + f and searching "client" keyword on the page.
Once you have downloaded the right one, you should unzip the package like this:
Select Administrator Type
To get the full power of Oracle client, we choose Administrator Type.
Create Oracle Home Owner
We choose to create a new Windows user oracle to be the owner of Oracle software.
Select Oracle Home
We should find a proper directory to store Oracle software. In this case, we use the default.
Pass Prerequisite Check and Summary
As you can see, we passed the prerequisite checks and it summarize some information for us.
Save Response File
It's a good habit to save response file.
Install the Product
If there's nothing wrong, we can safely install the product.
The installation is successful.
Allow the App to Access Network
To access the network, we should put Oracle client in the white list of Windows firewall.
Later on, you may use NETCA to add a TNS entry graphically.
To have a faster way to install Oracle client, please check: How to Install Oracle Client Home on Windows.