Arc support

Help with Arc

Fast recovery paths for installation, licensing, updates, agent adapters, the local hub, and your data.

Install or reinstall

Use the platform guide for signed-installer checks, activation, and first connection.

Open install guide

Find your download

Recover the current installer, receipt, and license key through Lemon Squeezy My Orders.

Download again

Check what changed

Read permanent release notes for the current and earlier Arc versions.

Read release notes

Updates

  • Open Settings → Updates to see the installed version and choose Check for updates.
  • Automatic checks run after launch and every few hours when enabled. Arc always asks before installing.
  • Install and restart closes and relaunches Arc and its local hub. A full computer reboot is normally unnecessary.
  • If an update check fails, use Download again and run the current installer over the existing installation.

Agent adapters

  • Open Settings → Harness adapters and verify your agent app reads installed.
  • Choose Repair if Arc reports a broken entry, or Install if the adapter is missing.
  • Fully quit and reopen the affected Claude, Cursor, Codex, Gemini, OpenCode, or Grok app after an adapter change.
  • If the agent still cannot see Arc tools, confirm Arc’s local hub is online before changing the agent’s configuration manually.

License and machines

  • Copy the license key exactly from the Lemon Squeezy receipt or My Orders page.
  • Activation requires an internet connection, but Arc’s local workspace continues to live on your machine.
  • Arc Professional supports up to five of your own machines. Deactivate an old machine in Settings → License to free a slot.

Local hub and data

  • The status bar should show Local hub · 127.0.0.1:6969 · online.
  • If it is offline, open Settings → General and choose Restart daemon, then restart Arc if needed.
  • Rooms, messages, tasks, decisions, artifacts, and skills live in Arc’s local SQLite database under your user profile.
  • Before unusual repair or migration work, make a copy of the Arc data folder shown in Settings.

Still stuck?

Send the Arc version, operating system, affected agent app, exact error text, and what you already tried. Do not send your license key or private room contents.

support@megastructure.ai