To check out the latest version of Zoneminder, you will need to type the following on your system.
svn co http://svn.zoneminder.com/svn/zm/trunk zm
Or you can browse the repository directly.
Please note that this repository is read-only and is updated at least nightly, though there may not be any changes for several days at a time. This version may contain new bugs and errors and is intended for expert users, if you are unsure whether you need this version then you probably don't and should download a stable release from the ZoneMinder main site.
You can click here to visit the main site.