But when i open the link is in Program files - Addon Manager - couatl_liveupdate_notes, i have this :
As I've said, it's not normal, and it's not what I see here. I can see the last version of the page, even when opened from the Couatl Updater. Try pressing F5 when the release notes appear, maybe it's some kind of bug in your internet explore cache setting.
But even if your release notes are not showing the latest version, that doesn't mean the FILES won't be updated, because they don't rely on the default internet explorer cache.
Note that this is relevant anyway, since, as I've said, NO UPDATE IS REQUIRED TO USE GSX in P3D 4.3. The update is only required to get the latest files, which might add new liveries, fix some bugs, etc.