by schaka » Thu Jul 09, 2015 11:14 am
You cannot get charged unless you actually upload. The client downloads are not known to be tracked by Blizzard's lawyer, so even if you torrented the client, you wouldn't have to worry about receiving a letter.
You do need to be careful with movie/music/TV show torrents though, especially HBO and Warner Bros. have their popular content tracked and you will receive a letter ordering you to pay ~600€ or go to court with them.
Source: my own research after getting caught without a VPN and having to pay up