Hi There,
I was seeing if I had the latest version of ZBrush and went to Zplugin AutoUpdate Check New Updates.
A popup appears telling me that-
There is a new update available for ZBrush,what do you want to do?
Close ZBrush and install the update or Do not update and continue ZBrush.
I have done this closing several times including also deactivating and I always get the version of ZBrush 4R7 I started with
without the P2 or P3 showing up (and so it seems that it is not upgrading properly.