Official MatterViz/WebView GUI package for Multiwfn 2026.7.10. Includes Linux, macOS and Windows packages with the MatterViz frontend, native Rust Host and Multiwfn executable. The formal runtime uses versioned in-memory control, picker and binary-volume pipes; packages contain no Python or 3Dmol runtime and normal sessions create no manifest, structure, control or dynamic Cube artifacts. CI calculates a real uncached orbital and verifies binary delivery, Return/process shutdown and zero runtime artifacts on extracted Windows and Linux packages. Cube fallback is diagnostic-only and requires MULTIWFN_MATTERVIZ_ALLOW_CUBE_FALLBACK=1. Linux requires glibc 2.35 or newer and a WebKitGTK 4.1 desktop environment.