Info:

2021.5.1 Update

This update focuses on fixes and tweaks to improve the overall ZBrush 2021.5 experience.
SubTool saving updated when using SculptHD mode
Resolved HD Geometry stability issue
Dynamic Subdivision with FiberMesh no longer causes visual artifacts
Material Transparency rendering issue resolved
Dynamic Subdiv causing artifacts when rotating has been updated
ZBrush To Photoshop CC updated to fix a layer issue
Scale Master updated to work with Dynamic Thickness and will now detect hidden geometry
Decimation Master updated
Axis Rotation updated
Maya BlendShapes updated
Maya .ma ascii file export fixed
Option Added: When adjusting the slider the Shift key can now round to a whole value
Poseable Symmetry returned to 2021.1.2 functionality and works with multiple subdivision levels
Inflate brush updated to take advantage of Thick Skin
DemoHead project restored
Default UI tweaked

Get PixologicZBrush2021.5FinalWorkingFix files for the fully working non-crashing version

Pixologic ZBrush
Pixologic ZBrush sets the industry standard for digital sculpting and painting. Its features enable you to use customizable brushes to shape, texture and paint virtual clay. Plus, in a real-time environment that provides instant feedback. Be empowered by the same tools employed by film studios and game developers. Likewise, toy/collectible makers, jewelry designers, automotive/aviation designers, illustrators, advertisers, scientists and other artists the world over use ZBrush. In fact, we have even received an Academy Award for the technology that powers ZBrush.