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"Can't specify an external sharing model for Custom_Object__c" ERROR when attempting to install MassMailer package

If you see the error, "Can't specify an external sharing model for Custom_Object__c" when attempting to install MassMailer package in an org where External Sharing is disabled, please follow the instructions at the following link to rectify the same. 


https://success.salesforce.com/issues_view?id=a1p3A000000mDGlQAM&title=can-t-specify-an-external-sharing-model-for-custom_object__c-when-attempting-to-install-a-package-in-an-org-where-external-sharing-is-disabled 


This is an issue reported to Salesforce and would be fixed for Spring 18 release as per the note by Salesforce.

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