Re: Regular wp theme to a buddypress theme?
That link only gives you the latest bleeding build of BuddyPress.
It has absolutely nothing to do with building a theme.
I hate to repeat myself, but…
If you want to customize or make changes to the default BP theme, read the following article to create a child theme:
If you’re using an existing WordPress theme, then only use the BuddyPress Template Pack plugin with your WordPress theme:
It helps if you know the basics of developing webpages and/or creating a WordPress theme. If you have no idea how to do either, you might find theme customization challenging.