When I fired up BeerSmith on the evening of Friday, August 13, 2021 I was informed a new version exists. Perhaps, Brad's versioning is off? However, an update did happen.
Weird. What does your current "Help - About" say? I just checked and I'm still at 3.2.7, as is Brad's web site.
I also did the "Check for updates" just for grins and that also says I'm on the latest release.
Checked it right now and mine wasn't updated. I had to "check for uptakes" in order to do so. I'm running it on a Macbook with Mojave OS. Now it's ok with version 3.2.7 - Thanks for the advice!