Update Luna
Follow the steps for this computer. Your account stays on this machine.
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Download
Get the new disk image. Leave this Luna open until the new one is in Applications.
Download for Mac -
Replace the app
Open the disk image and drag Luna onto Applications, replacing the old one.
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Open the new Luna
Quit this Luna, then open the new one. If macOS says the developer cannot be verified, right-click Luna and choose Open.
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Allow sound again
Turn the microphone and screen recording back on if macOS asks.
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Download
Get the new installer. Leave this Luna installed until the new one finishes.
Download for Windows -
If Windows blocks it
If SmartScreen says Windows protected your PC, choose More info, then Run anyway.
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Install over Luna
Install over this Luna. Do not uninstall first.