Simply copy the entire mod directory into your "Starbound/mods" directory,
commonly at "c:Program Files (x86)SteamSteamAppscommonStarboundmods".

If you wish to use one of the original Starbound races with SMEE and have access
to the Normandy, it is recommended that you download and use one or more of the
SMEE versions in the optional race package. You will need to install SMEE first
and then place a mod from the optional package alongside SMEE into your
Starbound/mods directory.