Surprisingly, yes—under specific conditions.
: Files must usually be unzipped into the ZStartup\ZPlugs64 folder. If placed incorrectly, the "ZRing Builder" menu will not appear in the Zplugin tab. Zring Builder 5 3D model - CGTrader
While not "Ring Builder 5," the repository contains a free script called Easy Ring 2.0 . It lacks the advanced stone engine but can generate basic tapered bands.
Avoid any sites offering "cracked" or "pirated" ZBrush plugins – they often contain malware, and using pirated software harms developers.
While you may find "free" links on third-party forums or video descriptions, these are often unofficial and may carry security risks or outdated files. For those looking for free alternatives, Maxon offers the plugin for free, which provides basic ring band basemesh generation at precise dimensions. Installation Guide
You miss out on the crucial updates required every time Pixologic (Maxon) releases a new ZBrush update.