Download the latest version of OpenVPN application (file Windows Installer 32, 64, ARM64 bit - depending on your system).
Install the OpenVPN app.
Allow installation of the program.
Run OpenVPN app.
After launch, a folder for configuration files is created.
In the Subscriptions download OpenVPN files and extract the ZIP archive to the Desktop.
Copy OpenVPN files from Desktop to folder:
C:| Users | (User name) | OpenVPN | config
Connect to OpenVPN server on Windows 10.
Connection successfully established.