Just to share my experiance:
Yesterday I did not update from 2.8.2., although I saw in the Universal Installer that the button for GSX PRO was not showing "Check" but showing "Update". I did not push the button however as there where no release notes, which I found strange. So went to the Forum and found that Umberto advised that unless there are new release notes do not push the button "Update" ( an advice which I found might easily lead to misunderstandings - as was expressed by others).
Anyhow, today I read in one of Umberto's messages in the Forum that the update is now ready, so today I again opened the Universal Installer and found the status in my case showing "2.8.2. is installed" and "2.8.3. is the latest" and the button "Update" waiting for my push -> so all as to be expected BUT no realese notes under Release Notes?
Nonetheless I "pushed my envelope" by trusting in Umbertos forum info of today "The Update is ready now" and pushed the update button, update went through with lots of small files fairly fast, and it works in MSFS, BUT as mentioned below - the release notes for 2.8.3. are still not shown in Universal Installer.
For anyone who is interested in them here is a link for them
https://www.fsdreamteam.com/couatl_liveupdate_notes.htmlAndreas