"This installer can't be opened because Apple cannot check it for malicious software"

Starting in macOS 10.15 Catalina you may see the following message when trying to run a software installer package:

Screen_Shot_2019-10-08_at_16.16.53.pngTo get around this warning, right-click (or ctrl+click) on the installer and select "Open":


You'll then see the same warning notice again, however this time there will be an additional "Open" button that you can click to run the installer:


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