I think what he is saying is the same thing I am experiencing.
On my version 2.3.7 I clicked XenForo 2.3.7 Patch 1 is now available.
It installed Patch 1 without issue.
Today, there is no notice to update Patch 1 to Patch 2. It is not showing up.
The only reason I discovered this was because I did not upgrade my test forum, and now my test forum shows a notice XenForo 2.3.7 Patch 2 is now available, but the live forum that upgraded to Patch 1 does not show the Patch 2 notice.
Upgrading XenForo follows a very similar process to installation.
docs.xenforo.com
XenForo will periodically check to see if your license has access to a newer version. To manually check, you can go to the Tools > Upgrade check page of the control panel. If a new version is available, you will be given the option to upgrade to it.
When the update came in yesterday i upgraded both the addons and the software.
So far no issues from my end on my site. I'll update the other two tomorrow and see if anything happens