It looks like something is going on with the roll-out of new versions lately.
When I was running 16117 (2016-04-26), I got the message that a new version was available for installation - 16124 (2016-05-03). When I started to install that version, I get a message that an update was available - 16130 (2016-05-09). I downloaded and installed that one instead.
Yesterday evening - when checking things to reply to this thread - I saw that a new version was being downloaded - 16131 (2016-05-10) but this morning, when I wanted to install this one, I get a new message saying that an update is available - 16132 (2016-05-11). That’s the one I’m running now.
A short while after install and launch, a similar dialog box pops up, and I assume that one has to click the X at the top right to get rid of this. An OK would be nice here, yes.
As for the Cycle thing you mention, @clement, how do you switch to “Cycles for Rhino”? A while ago, the Cycles rendering plugin was taken out and then only the realtime version thereof was available as the display mode called “Raytraced”. The only available render engine (as such) is the Rhino Render: