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(In case I messed up) https://www.strawpoll.me/12001740 https://www.strawpoll.me/12001854
Get 7zip here (compatible with .RAR, .7z, and many other formats!) Info about it here
Something I stated in another thread, but didn't realize until after that this is the proper location for that discussion. I'm not sure if I'm correct, but it may be possible for you to be able to create a new updated torrent files with your updated files (when you update the game) with any with already existing/old files that don't need replacing, which would help with saving bandwidth.
Something else I hadn't mentioned that I just remembered, was another method that could potentially be useful. A file syncing program called "Resilio Sync" https://www.resilio.com/ , which does have that option, as it only relies on the independent files, as opposed to a "torrent hash" (which is created on each torrent creation).
EDIT: Oh, by the way, please do not use utorrent. It's riddled with ads, and was bought out several months ago. Here's a list of torrent clients https://en.wikipedia.org/wiki/Comparison_of_BitTorrent_clients and the 2 I personally have used after utorrent hit the fan https://en.wikipedia.org/wiki/Deluge_(software) https://en.wikipedia.org/wiki/Tixati
EDIT2: Another useful thing is having a direct (or indirect, like on MEGA or mediafire) link to the zipped [preferably using maximum compression] update(s), as those are easier to download than through the launcher. At least in my experience.