Hi there 
I am using Envato API to update theme from themeforest.net but I have small problem when download file from https://marketplace-downloads.content.envato.com
It show error:
cURL error 35: error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure
I tried to download with another host (i.e. https://abc.github.io) and it worked.