I needed to manually update the theme version and Rev.slider to be current. But is there any way we can update them from wp's dsbd updater? 

I mean manual update is to download the data from the envato link and upload them through FTP. For some reason customer support directed me to do this way. 

But usually wp theme offers easier update through envato plugin or plugin updater. Otherwise we will miss the latest version and might cause security hole. Please advise