Live update just ran, and notes that SSAA is now active, however, I'm noticing the same textures installing at the beginning of live update, and the SSAA detection is done after the textures are installed.
You are assuming the textures are first being "installed" and then "detected", which suggest a backward approach, but that's only because you don't know that, when you see the "detection" message, the textures that have just being first updated, are then COPIED from a backup folder into the actual folder and, of course, the source folder of the copy is the correct one, depending if SSAA is detected or not.
Also, I think the file names of the textures are the same as what was previously being installed when the SSAA flag was DISABLED.
The file names are of course the same (it would be foolish to do otherwise, since it would required to also distribute a different .BGL which is really the same, JUST pointing to a differently named texture), but the textures are NOT the same.