Same issue for me, every time I open it it wants to update.
I did the initial update directly from download. The first time I opened it told me there was an update. I checked to see that the download install worked, or at least reported the right version. Next time I opened it, same thing, so I told it to update anyway. Ran through the update and still same version, and still reporting the update every time.
Found the sticky post, running 2.2.09, installed 2.2.12 and it looks like it fixed the issue.