Problem updating to 1.25

I recently tried to update from 1.23 to 1.25 and received the following during update:

The update process is starting. This process may take a while on some hosts, so please be patient.

Enabling Maintenance mode…

Updating Theme Perth Pro (1/1)

Downloading update from…

An error occurred while updating Perth Pro: Download failed. Unauthorized

Disabling Maintenance mode…

All updates have been completed.

Hello there,

Please check your current Perth Pro version in the theme’s administration panel. Is your site already running 1.25?

aThemes Support