HiCustomer Thank you for asking.
There is probably some program like a download manager that thinks it still has work left.
If you know the name of it then you can look at the task manager and end it.
Press CTRL-ALT-DEL at the same time and choose Task manager. Select that progam and click end task.
Then use a different way to connect to FTP to get the files. Or uninstall that program and reinstall it and try again.
I use the command line FTP. let me know if you need help with that.
I'm sorry, I didn't realize you are using a MAC. I'll opt-out of this question and transfer it to the MAC category so another expert will be able to help you.