Buying p2p sharing software or not will make no difference whatsoever to your local laws on copyright file sharing if you choose to download copyright files.

uTorrent & Vuse (previously called Azureus) are much better programs for torrenting though compared to LW. LW's abilities are limited. You also would not be able to get into private torrent sites using LW if you were ever invited into one. But sure, LW works with torrents & you can choose to use it for that purpose.