Fotografie PRO Update is not working.

I am trying to update the theme however a error came up. I'm currently using a child theme. I tried every thing still not working. This is the message: The update process is starting. This process may take a while on some hosts, so please be patient. Enabling Maintenance mode… Updating Theme Fotografie Pro (1/1) An error occurred while updating Fotografie Pro: Update package not available. Disabling Maintenance mode… All updates have been completed. Return to Themes page | Return to WordPress Updates page