That is great!

You can execute this command from either the destination, source, or even a different machine.

From destination:
scp username@droplet_ip:/path/to/file /path/to/destination

From source:
scp /path/to/file username@destination_host:/path/to/destination

From elsewhere:
scp username@source_ip:/path/to/file username@destination:/path/to/destination

As I do not know what OS you are using I cannot tell you what to do specifically.

If you are using Linux you can use the noted commands above adjusting them to suit your setup.

OR

You can install a program like Cyberduck (Windows/Mac) and connect to your server via FTP/SFTP and download the file using this application.