I have had the same problem. I followed all the troubleshooting ideas on the link posted above, but the problem persists. I gave full permissions to the upgrade folder, have unlimited disk space on my server plan with hostgator, there are no files in the upgrade folder (visible or hidden), and I have always been able to update before just fine.
This is the exact message that shows up:
Update WordPress
Downloading update from https://downloads.www.ads-software.com/release/wordpress-4.6-no-content.zip…
Download failed.: Problem with the SSL CA cert (path? access rights?)
Installation Failed
Any help or ideas would be appreciated
