BuddyPress.org

If you goto the directory where you checked out the svn repository, and run this, it will tell you the version you currently have checked out:

svn status -u

The out may look something like this, depending on how close to current you are:

~/public_html/beta/buddypresssvn]$ svn status -u

Status against revision: 845

if you are not up to date, it will show changes between your checkout and the trunk, similar to this:

~/public_html/beta/buddypresssvn]$ svn status -u

* 844 bp-languages/buddypress.pot

Status against revision: 845

This tells me that the language file has been updated since my last checkout.

you can then run

svn up

to bring your directory up to currrent status.

If you used the zip to download a copy this will not work.