If you go on the Garmin website and go to the Forerunner 945 and then on the right side under "Related" and you click on "Software", it brings you to a page that says:
Why is it showing 2.48? 2.50 is already out. Shouldn't this be updated?
In the past, both Beta and Live updates could be manually downloaded to the watch before they were pushed either OTA or via Garmin Express (or maybe quicker via the very old Web Updater 
). I think sometime around the launch of the 935 they changed the manual live update to a phased release system that was only deliverable to the user and could not be manually downloaded anymore. The beta builds are the only manual updates (and the occasional GPS/Sensor Hub updates).
I think that's why the Software link on the watch device defaults to the latest Beta to download; you can't get the manual update, and you don't have to anymore, the moment you boot up the watch you should be delivered the latest live build.
Maybe they change the name of "Downloads" to "Experimental updates."
