BP Community and/or BP Corporate – Update Process Questions

I’m currently using two themes on my WPMU/BP sites at http://www.networkit.com

As new updates are rolled out, I’m abit confused in the documentation about just exactly the best way to go about updating my themes. I’m activating the “child” version of my themes.

Having said that…when an update to a theme is available, is the the correct order to perform the update:

1. Download zip file

2. Unzip locally

3. FTP all files EXCEPT the child theme directory to my /wpcontent/themes directory

Correct? Please advise. Much thanks.