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Download Islet.dmg, drag it to Applications, then on first launch use System Settings → Privacy & Security → Open Anyway (Islet is open source but not notarized).
Or with Homebrew:
brew tap znlong2203/islet https://github.com/ZNLong2203/Islet
brew install --cask znlong2203/islet/isletFull Changelog: v0.1.0...v0.1.1