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Get this error message after install "“R” can’t be opened because Apple cannot check it for malicious software."

That link is to instructions how to circumvent the check, however, the CRAN R releases are notarized by Apple (i.e. they have been checked by Apple for malicious software), so unless you are sure that you definitely have a release from us circumventing it only enables possible attackers to install illegitimate software on your Mac. So I would strongly recommend following the instruction on the CRAN page to verify the signature of the downloaded package before overriding the Apple security measures.

Cheers,
Simon