Have you gave the Microsoft community the complete information, or just your assumption the cause was the Addon Manager ? Because, from your own log, I can see this:
A window similar to the previous one may also appear with the following File:
File C:\CMeteoXml.dll
So, it's very possible that, a problem in your FSX install, possibly caused by that add-on, which is not related in any way to any our products, might have caused the sim crash, which in turn made our software crash as well.
Have you possibly enabled some kind of Compatibility mode to FSX, like Windows 7 mode in Windows 10 ? These should be disabled, which is how FSX gets installed to by default, and they might have also caused the supposed problem with the Addon Manager.
If you run the FSDT Live Update, it will disable any Compatibility you or another add-on has set for FSX. However, sometimes Windows itself mistakenly set a compatibility flag automatically, trying to "help" with an application IT things it's "old". Which is also why, I suggested to update FSX to the Steam version, since FSX SP2 still has lots of unresolved issues nobody will ever fix.