[App_rpt-users] Updating Asterisk

Hi all, Do I need to completely rebuild the system from CD created from a newly downloaded ISO to update my node to the latest build? Or, can I do it from the comfort of my desk by using the method given on the developer section of the QRVC website? I tried to update the app_rpt app, which worked fine but I wanted to use the new "CTCSS encode only when RX mute open" feature. This didnt work for me so I figured I needed to update chan_usb as well but there are some errors that get reported when I try and make it. Thanks, Matt