My computer got restarted at night due to a Windows update. In the morning, my screen showed a uTorrent Web notification about file associations. I let it re-apply the associations.
Then it told me there is a critical update and that uTorrent Web will not work if I do not install it (or something similar, maybe will not work for long), I let it update.
I got the uninstall wizard. Weird, but fine, maybe it will re-install itself. Nope, it did not. uTorrent Web decided to uninstall itself.
(It kept itself in the start menu, but the shortcut leads to a non-existent path)