I don't have many hard and fast rules in my life, but one that I've learned through painful experience is this:

Never Update a BitTorrent Client

Version 1 of every bittorrent client is lightweight, fast, and does nothing besides torrent your bits. Version 4 is 400gb, takes 30 seconds to load, shows ads, installs a rootkit phoning home to the NSA and mines bitcoin in the background.

This is an inviolate for bittorrent clients. There never has and never will be an exception.