You have to do both. It's getting a bit trickier to get this stuff working.
I'm assuming you mean AND installing the lunar lakes sims3pack (after being decrapped) AND putting the package file in the mods file.
I did that (lunar lakes installed fine).
Or is there also a sims3pack of the tree somewhere to be found.
Oh and I tried the tree in Sunset Valley... not Lunar Lakes (don't know if that makes a difference)