That wiki page is out of date. I've kinda "inherited" the tivo plex plugin. The original dev is no longer actively working on it. I made some changes to get it to work with Plex 9, but that is as far as I've gotten so far.

There are currently some serious limitations to the plex plugin. The primary one is that it is currently limited to OSX plex media server installs. The plugin uses OSX specific command line programs to discover and browse tivos. I actually had a version working on windows for discovery and browsing. But I was never able to get streaming to work correctly. The version I had working was using an all python based code for discover and browsing. So it should in theory work on Windows, Linux, and OSX.

My ultimate goal would be to get the Tivo Plugin working well enough so that I can use a Roku as a thin client on a TV w/o a Tivo. In theory all of the pieces are there, its just a matter of getting the all working together.