They did re-vamp the website and that may have been inadvertently omitted. If I recall, a previous re-vamp also omitted that, and I remember a support question being asked at one time (and someone did upload a link to where that is, and I can't find it, nor did I save it). Based on that, the histories may exist, they just aren't linked at this time.

You probably already know that the history shows as part of the updater installation. It's easy to just click past that, of course.

I did a little looking around and found a link to the BLS-2019 update history.

You can look at that update by clicking here, and with each subsequent release the text at this link should be further updated. Optionally, you may want to bookmark it.