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1

Download

Get the latest .dmg from flux.emreb.dev/download, drag Flux to /Applications and open it. Flux is a universal build: Apple silicon and Intel, macOS 13 or later, signed with an Apple Developer ID and notarized by Apple, so macOS opens it like any other app.
2

Sign in

Flux asks you to sign in with an email link or code, or with GitHub or Google. The account holds only your synced preferences; see Where your data lives.

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Updates

Flux checks for a new version at launch and every hour. A new version is offered a few minutes after it is published, and installs with one click; Flux reopens where you left it. When an old version can no longer be used, Flux asks for the update before anything else.