I have received a message about a newer Stand Alone Manager available. I currently have version 2.9.0.3. I have clicked on do not update.
I received a message that a newer version of KFLL was available which I ignored since I believe I have the lastest version from about two years ago
If you keep ignoring the prompts to update, which are obviously made for a reason, something will not work at some stage, the whole point of the Live Update notifications is that you don't have to figure it out which version you have, which version is available, if the update says you don't have the most current version of something, then you don't have it...
The Stand-Alone Addon Manager installer contains many additional files that gets updated constantly, even if the base Addon Manager .DLL doesn't change so, just trust the update notifications. Same as for KFLL scenery, it was updated very recently so, if the update notification says you have to update, then you have to update...
So, before doing anything else, just update everything that says it wants to be updated, and see if it works.