When installing Atom Packages some machine will receive a error as

failed: unable to get local issuer certificate (UNABLE_TO_GET_ISSUER_CERT_LOCALLY)

PS C:\Code\NodeJS Exercise> apm install split-diff
Installing split-diff to C:\Users\zack.dawood\.atom\packages failedRequest for package information failed: unable to get local issuer certificate (UNABLE_TO_GET_ISSUER_CERT_LOCALLY)

In order to fix this execute the following command

apm config set strict-ssl false

Now install the required package, it should work

apm install split-diff