I went to
http://www.mtu.com/basics/karaoke.htm and downloaded from the Microstudio manual link.
It installed at C:\Program Files\MTU\Manuals\Microstudio Manual without my doing anything different, which did not touch the Hoster folder.
It contained the mstudioman.htm file that is the manual page, along with all its images and other inclusive files. I opened this in Internet Explorer and it is the final Microstudio 2.609 manual.
Please post the exact URL that you clicked on our site to download what you indicate above so I can duplicate the problem.