Backgrounder - Why Core FTP is a default for CPANEL
Core FTP is a default for CPANEL because it proper implementation for secure file transfer methods like SFTP (SSH File Transfer Protocol) or FTPS (FTP over SSL/TLS).
SFTP is an FTP protocol that runs on top of a the SSH (Secure SHell) protocol, while SSL/TLS refers to standard FTP running over a SSL (Secure Sockets Layer) connection. There is some confusion about what SFTP is when some organizations are incorrectly using the term. They are referring to SFTP as Secure FTP, when it is actually standard FTP running over an SSL connection, and not actual SFTP. Chances are, if you are new to secure FTP, you are most likely using SSL, and not SFTP. While they are similar in terms of secure connections, they are completely different protocols. If you can't get your secure FTP connection to work, make sure SSH is unchecked, and SSL is checked when connecting to secure FTP servers.
Here's how to import a config file (.coreftp) that you download from CPanel into Core FTP LE
There is no function to import under the top menu. It's not under File, etc.
You have open the Site Manage located under top level Sites menu. In Site Manager windows, right-click into blank area (saved sites window) to reveal import capability.
1. Click Sites⇀Site Manager.
2. Right-click the main blank window and click Import⇀Core FTP.
You might want to change font size as well. Here's how to do that.
Personally, I find Core FTP the annoying because of a very un-intuitive design and ridiculously small fonts. Core FTP is freeware but has no publicly available source code.