Unable to Update All-in-One Event Calendar by Time.ly

We are using version 2.3.4 of All-in-One Event Calendar by Time.ly. It says we need to update to 2.3.12.

However, when we try to update we get an error saying:

Downloading update from https://checkout.time.ly/packages/all-in-one-event-calendar_2.3.12.zip…
An error occurred while updating All-in-One Event Calendar by Time.ly: Download failed. Not Found