The Addin system doesn't seem to be perfect. When I update the Addin in the network share, the version number immediately gets updated in the ArcMap Addin Manager, even though the updated binaries have not been loaded into the Assembly Cache. This can confuse people whether they have the most current version actually loaded.
I am trying to compare the version of the actual binary, to the version ArcMap thinks it has installed. Getting the binary version is easy, but I am having difficulty getting the ArcMap Addin version. Is there an interface for this I need to query? Or is this even possible to do?