For Arc owners

Download Arc again

Your installer and license key remain available through the purchase email address you used at checkout.

Current version

Arc 1.8.2

August 1, 2026 · Windows 10/11 (64-bit), or macOS 11+ on Apple Silicon.

Read release notes

Open Lemon Squeezy My Orders

Enter the email address used to buy Arc. Lemon Squeezy sends a secure sign-in link, then shows the Arc order, current downloadable files, receipt, and license key.

Open My Orders

Redownload in three steps

  1. 1

    Open My Orders and request the secure sign-in link using the checkout email address.

  2. 2

    Open the Megastructure Arc order and choose the installer for Windows or macOS.

  3. 3

    Run the current installer. If Arc is already present, the installer updates the application; your local project data is stored separately under your user profile.

If the order is missing, the email changed, or the download does not appear, contact support with the checkout email and order number if available.

support@megastructure.ai