Last week, I updated to the latest GSX with the addon manager.
Depending how old your existing GSX installation was, updating it with just the Addon Manager might not have been enough.
If your existing installation was older than June 1st, as indicated on the release notes (which can be displayed from the update notification), you had to download the full GSX installer.
Note that, as it happens, we JUST updated GSX again now, and the today's update ALSO requires the latest full installer, as the release notes are indicating:
http://www.fsdreamteam.com/couatl_liveupdate_notes.htmlIt's always best to check the release notes when prompted to.
As it was installing the features at the end of the specific feature it said not installed then the last thing it said was GSX not installed.
I'm sorry, but this sentence is not very clear. It's not even clear what your problem is. Maybe you THINK there's an error, because you saw some progress messages saying "not installed" ?
But those are not errors: the installer is simply telling that, since you don't have a product installed, there's no reason to download an updated file for it, so it's skipping it. For example, when it tried to update the Python code for, let's say, XPOI, if you don't have XPOI installed, it wouldn't make much sense if it tried to update it, wouldn't it ?
So, before doing anything else, try the current full installer, which has been just updated today.