It seems to me that it would facilitate communications if there were version numbers assigned to each different update.
The Digital Signature which you can check by right-clicking on the file Properties->Digital Signature, has a timestamp, which can act as an even more reliable version number than a "normal" version number, since it tells you exactly when the installer was signed.
The timestamp of the most current version of the installer is December 8, 21:28 UTC (Windows will display the time in your local timezone though) so, if you have an earlier version, you should download it again now.
I would like to remind you this is a BETA so, you cannot expect the same level of automation, notification of updates as the regular version.