I re-activated zbrush after formatting my computer, but when I open Zbrush I only see “Zbrush4” and some letters after that, but not 4r, how do I know if I have the latest?
If it’s the latest it will say 4R4 or 4R4 P2 (which is the patched 4R4).
You’re running plain old 4.0, which is a ways out of date now. Upgrade here: https://www.pixologic.com/zbrush/downloadcenter/instructions/