I just wanted to warn everyone.
The recent windows 10 feature update removed zbrush on my computer.
I have a full LEGAL copy installed from a download like most of you.
I reinstalled it with no issues but zbrush poses a unique issue because of where it store files.
BACKUP ALL YOUR PROJECTS in fact backup anything in the C:\Program Files\Pixologic locations as windows removed all of it.
thankfully I lost nothing of importance because I backup regularly.
If its already happened to you roll back windows and the files should return but as the updates will continue to happen backup everything immediately.
If this has happened to you please reply to this thread as I think people should be aware!