Nima,
Take the one from oacs-5-2, it is on beta yet. If you are thinking for production, please test it and report bugs before installing in your prod server. Probably Galileo will start to use it on production in a couple of weeks. Mostly a UI review is needed.
Yes, download all the lors-central dependencies.
Info about this new LORS:
https://openacs.org/news/item?item_id=292716