I have not updated my theme in some time. (Site is https://svdreamchaser.com) and when I went to update it today I received the error in the title of this post.
I host via Bluehost and have purged the cache data thinking that maybe was the issue however it does not seem to be doing it.
Because it has been some time since I updated the theme (Since version 4.6) I am not clear what plugins I have installed since that time.
I noticed that Cornerstone plugin was not updating either so I deleted that plugin thinking there was a conflict but it still did not update.
I looked at my license and they seem to be active and accurate as well. I have checked other entries and these items didn't seem to work for me. I also opted to NOT manually install as everything appears to be setup for auto updates.