Unable to update theme in WordPress to 4.5.2

To Whom This May Concern,

I currently manage my partner’s website for his business in WordPress. I recently learned of the Enfold theme version update. I’m currently using Version 3.8.5.

To update the theme, I logged into the wp-admin panel on his site, selected the Enfold tab in the left-hand sidebar, and then went to the Theme Update tab in the secondary left-hand theme sidebar menu. The instructions state: “Update your Theme from the WordPress Dashboard. If you want to get update notifications for your themes and if you want to be able to update your theme from your WordPress backend you need to enter your Themeforest account name as well as your Themeforest Secret API Key below:”

I entered my Themeforest username and my API Key and clicked the “Save all changes” button. The page then refreshed and prompted me: “Update Available! A new Version (4.5.2) of your Theme is available! You are using Version 3.8.5. Do you want to update?”

I clicked the blue “Update Now!” button. When I did so, the page refreshed and redirected to wp-admin/update-core.php?action=do-theme-upgrade. However, the message on that page read as follows:
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The update process is starting. This process may take a while on some hosts, so please be patient.

Enabling Maintenance mode…

Updating Theme Enfold (1/1)
Downloading update from …
An error occurred while updating Enfold: Download failed. Problem downloading theme

Disabling Maintenance mode…

All updates have been completed.

Go Back to Enfold Theme Panel
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I tried it a couple more times to no avail. I then chatted with a support person at BlueHost (my hosting company) and the support person was unable to fix the issue and suggested that I reach out to you, the theme provider.

I appreciate any and all support.