It says I have version 5.7.1 Yet, when I ask for updates, it says the program is up to date.
So what license do you have ??? Are you on CC or perpetual...
If you had posted a screen shot like mine that would have answered the question...
If you have a perpetual License for Lr5 what you have is correct.... then what are you missing??? Where are you seeing things missing?? Provide screen shot please...
Lightroom 5.7.1 was the last release of Lightroom version 5. If that is what you have, then you are up to date and there will be no more updates. It takes an upgrade to get anything more. An upgrade would mean that you purchase Lightroom 6 or subscribe to the creative cloud and install Lightroom CC 2015.