So you have the server already, you still have to run the 
installer to get version of Forge I built the current pack 
against.

The easiest way to upgrade is delete the config and mods
directories of your current installation instance and then
copy over the config and mods directory.

WINDOWS:
copy over the wget directory and the .bat files
execute install.bat and follow the instructions it
gives you

done

LINUX:
copy over CURRENT_INSTALLER, config.sh, and install.sh
execute install.sh and follow the instructions it
gives you

done

PROFIT! 
