No, only if to upgrade to beta versions or not. If you want a specific version, you'd need to search for it on some "old-versions" site, and replace the exe...
And I am not aware of any other app that provide such feature...
Since 3.6 is not stable yet, this specific version should not auto-update itself .
Also you can disable Pref->general->automatically install updates...
Backport to 3.5.5 for now (replace the exe)
https://forum.utorrent.com/topic/115517-steps-to-take-if-you-are-having-trouble-installing-µtorrent-classic/
No you are not "stupid", utorrent is... There is no reason in the world utorrent will categorize a new torrent as "hidden" (it's a user - action to set this label) . It's a bug.