VRM Add-on Breaks on Blender 5.2 LTS and 5.3 Alpha Due to Exclusive Version Cap

Users upgrading to Blender 5.2 LTS or 5.3 alpha have found the VRM Addon for Blender failing to enable, with testing conducted on macOS Apple Silicon on September 22, 2026. The root cause is the blender_version_max field in the extension manifest, which marks the first unsupported Blender version rather than the last supported one — an exclusive upper bound. Add-on version 4.4.0 was the first release to declare a blender_version_max of 5.3.0, making it the minimum version that works on Blender 5.2 LTS; earlier extension versions such as 4.3.0 cap out at 5.1.x. A workaround exists for versions 4.3.0 and newer: installing the legacy add-on zip bypasses the version gate entirely, since it carries no manifest version restrictions. Version 3.9.0 fails on all paths under Blender 5.x because Blender 5.0 removed an API that the add-on imports.
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