There is an INI file in your plugins directory.
c:\users\%you%\appdata\roaming\gramps\gramps51\plugins\lifelinechartview_warn.ini
Delete this file.
Warning: Windows makes the appdata folder hidden by default.
Now when you are prompted to install you should get a dialog to install some additional files. The ini file was preventing the prompt for the additional files so the views never fully installed.
The two views it creates under Charts are pretty neat.