macOS

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Cannot open PreYarn

Each Release of macOS makes changes to the gatekeeper security feature which may cause issues launching PreYarn, Refer to https://support.apple.com/en-us/102445 for more details.

Below outlines 2 workarounds.

Below shows screenshots from Sonoma (macOS 14.x)

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Method 1

Right Click on PreYarn (or press control and click on PreYarn)

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Select Open (you may be prompted for your password or fingerprint if you have touchid)

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Method 2

macOS will show any applications that were blocked for about an hour, to see the apps

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You may get a prompt for your password or TouchID

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Press Open

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Rosetta

You may be prompted to install Rosetta depending on the version of PreYarn and the platform (intel or mac silicon)

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Corrupted File

Launching PreYarn fails with the following, this is most likely due to the file being corrupted , redownload again or reachout to yarnlab support.

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