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Lacuna isn't in the Adobe Exchange marketplace yet. Getting there requires Adobe's own review and signing process, which takes time and money a beta-stage tool doesn't have yet. In the meantime, the installer flips a setting Adobe itself provides for developers (Premiere's debug mode), so the extension can load without going through that marketplace.
That's also why Windows SmartScreen or macOS Gatekeeper might flag the installer as unrecognized. It's genuinely from us, just not Adobe-signed yet. Click "More info" then "Run anyway" on Windows, or allow it under System Settings → Privacy & Security on Mac.