I've installed 18.104.22.168 three times and left the box ticked for "Install Windows Explorer Extension". I use Total Commander in place of the Windows Explorer.
The context menu does not appear in TC unless I choose the X64 option, but does using Windows Explorer. This was not the case when using Windows XP Pro SP 3. I'm now using Windows 7 Pro SP1.
Right click in TC.
Right click in Windows Explorer.