I've seen this issue previously and seem to be encountering it again...
I've got clients that are reporting to a server that is running 14.0.2415 (14MP2). There is a mix of clients that are running versions including 14.0.2415.0200 as well as 14.0.2332.0100. We've also got 14.0.1904.0000 and 12.1.6465.6200 and 12.1.7004.6500
The problem we are having is that the older clients are not picking up and installing the upgrades that should be (and are to the best of our knowledge) available to them.
We've got Install packages available, and I can see where the clients know there is an upgrade available, but they are not applying the upgrade as expected.
What's the best way to troubleshoot from here on why these clients are not doing the upgrading we are looking for?
One of the SA's that is working with me has done a little testing and has encountered at least a couple of clients that are now saying "Client has ignored upgrade package, version 14.0.2415.0200. The client decided to reject the upgrade package"