I've read the other responses. I suspect that the problem comes from
having "several versions", all of which have apparently been updated at
different times. I suspect detritus left over from different updates is
confusing the update/version query. If so, you may be able to fix it
with a simple uninstall + clean install of the latest version. Worth a
try, you've already spent more time on this than a clean install would
have taken.
FWIW, I'm on the ESR channel, and the latest versions is 45.4.0.
--
Best,
Wolf K.
kirkwood40.blogspot.ca