Mac: "KubeUI-osx-x64-Setup.pkg" cannot be opened because it is from an unidentified developer.

[IvanJosipovic]

If you receive one of the following errors on a Mac, this is due to the application not being signed with a Apple Developer certificate. See link for more details, https://support.apple.com/en-ca/102445

"KubeUI-osx-x64-Setup.pkg" cannot be opened because it is from an unidentified developer.

"KubeUI" is damaged and can't be opened. You should move it to Trash.

Workarounds

In Terminal, run one the following commands depending on which release type was downloaded.
Note, this only needs to be done one time.

Setup.pkg

xattr -d com.apple.quarantine /Users/{username}/Downloads/KubeUI-osx-x64-Setup.pkg

If you receive the same error after the Setup, run
xattr -d com.apple.quarantine /Applications/KubeUI.app

Portable

xattr -d com.apple.quarantine /Users/{username}/Downloads/KubeUI.app