An error occurred while updating Enfold: Download failed.

Hello, I’m trying to update Enfold from the Enfold Them Options/Theme Update panel.
This is what I see:

Update Available!
A new Version (4.5.5) of your Enfold Theme is available! You are using Version 4.4.1.
See what’s new in change log. Do you want to update?

Everytime I hit the Update Now! button, I get this: An error occurred while updating Enfold: Download failed. A valid URL was not provided.
I also get a bunch of warnings that I placed under Private Content because they include part of the url of my website.
Please help.
Thank you,

Daniel