Here is a neat trick to check the version number
before installing it:
In the link I gave, change the file extension from .pkg to .pkm.
So now the link becomes
http://swcdn.apple.com/content/down...ds883msggps8aroh0q5o/GatekeeperConfigData.pkm
Now download the .pkm file and open it with textedit.
Inside you will see something like
CFBundleShortVersionString="111"
and 111 is the version number.