When you are finished downloading the torrent, then
delete this file:
Interface/FrameXML/SecureCapsule.lua
delete this folder:
Interface/Addons/Blizzard_StoreUI
This fixes not being able to trade or mail gold or items to your alts, or anybody ingame. You find details and explanation in the bugtracker: https://firestorm-servers.com/en/report/see_report/40820#report_message_136386
Also, rightclick the game folder, uncheck the readonly flag and press Apply / Ok. uTorrent makes it readonly, and causes the "CAS failed to initialize issue":