Shove installed a launch daemon or agent popup window, what is it?
To answer your questions in order....


This does appear to be a BlockBlock dialog box.  A quick look at their webpage shows a similar dialog to the one you've posted.





This warning is telling you that Adobe is attempting to install/update Adobe Flash Player
Do you use Flash Player?  If you do, then yes.  If not, you should investigate what is attempting to install Flash Player (what did you download and open up?)


*On a side note, a more pragmatic question you should be asking yourself is "Why, in 2018, are you still using Adobe Flash?"