The version indicates a mature product. This isn't a beta or an alpha; it’s a stable, refined release. The ".mcpack" extension is the standard file format for Minecraft Bedrock Edition add-ons (Windows 10/11, iOS, Android, and Xbox).
If you are looking for a more comprehensive UI overhaul, the full pack (currently at version v3.2.9) provides a 75% accurate recreation of the Java Edition menus, inventory, and settings for Bedrock users. VDX: Java/Desktop UI v3.2.9 [v1.21.130] - CurseForge VDX-DUI-v3.2.2.mcpack
: Click the "cog" icon on the active pack to toggle between different UI modes, such as "Legacy Desktop UI" or "Java UI". VDX: Java/Desktop UI v3.2.9 [v1.21.130] - CurseForge The version indicates a mature product