> "ZBrush was first released '1999' as a tool by artists, for artists.

> "ZBrush was first released '1999' as a tool by artists, for artists.
>
> Our vision has always been to develop new and innovative features
> that push the boundaries of what has been previously possible for
> digital art. We are thrilled to offer this new breakthrough 10th
> Anniversary ZBrush 4.0 version.
>
> We trust that this exciting version of ZBrush will continue to be a
> major part of your day to day artistic work-flow, opening you to an
> ever expanding world of creativity.
>
> Enjoy the journey and discovery!" -Pixolator aka Ofer Alon quote

ZBrush 4.0 is packed with new and exciting features, additions and
changes designed to fit your needs and the way you work.

? ZProjects
? Best Preview Render
? Project Presentation
? Concept Creation
? Hard Sculpting
? Major Brushes
? Strokes
? Pipeline and Productivity
? 3D Painting and Materials

Through GoZ ("Go ZBrush"), available starting in Version 4, ZBrush
offers integration with other 3D graphics programs such as Autodesk
Maya, Autodesk 3ds Max, Cinema 4D, LightWave 3D, Poser Pro, Daz
Studio, EIAS, Modo and Blender.

Also see: [ZBrush 1.x][1], [ZBrush 2.x][2]
________________________________________________________________________________________________

ZBrush 4.x*** released 2010 No longer supported due to its extreme
age. [~Publisher Statement][3]
________________________________________________________________________________________________
I'll check up on it, and add updates and plugins -if I find any.
Also, as I'm currently on OS 10.8, I do not have an app that allowed
the archive to be split.
________________________________________________________________________________________________

Compatibility
Architecture: x86 (Intel:Mac)

Minimum Requirements
Recommended:
? OS: Mac OS X 10.5 or newer. 32 bits or 64 bits.
(ZBrush 4 is a 32-bit application, but can use up to 4 GB of system
RAM when run under a 64-bit OS.)
? CPU: Intel Macintosh.
? RAM: 2048MB recommended for working with multi-million-polys.
? Monitor: 1280x1024 monitor resolution set to 32 bits or Millions of
Colors.
? Pen tablet: Wacom or Wacom compatible.

Minimum System Requirements:
? OS: Mac OS X 10.5.
? CPU: Intel Macintosh.
? RAM: 1024 MB. (2048 MB recommended)
? Monitor: 1024x768 monitor resolution set to 32 bits or Millions of
Colors.

[1]: http://macintoshgarden.org/apps/zbrush
[2]: http://macintoshgarden.org/apps/zbrush-2
[3]: https://www.zbrushcentral.com/t/zbrush-4-0-activation-and-registration-troubleshooting/293755#post1035781