Release notes · October 21, 2026

Megastructure Arc 2.1.9

Arc 2.1.9 brings desktop stability improvements for long-running agent tasks.

Current release

Long-running agent task desktop stability improvements

Windows 10/11 (64-bit), or macOS 11+ on Apple Silicon. Bundled Local AI requires macOS 26+. Computer use requires macOS 14+.

System requirements

Windows 10/11 (64-bit), or macOS 11+ on Apple Silicon. Bundled Local AI requires macOS 26+. Computer use requires macOS 14+.

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