I am tryin to install the App "Any Record Hierarchy" (https://appexchange.salesforce.com/appxListingDetail?listingId=a0N3A00000G12hNUAR) from AppExchange on my Sandbox, but i get an error: Problem:

  1. Unexpected Error The package installation failed. Please provide the following information to the publisher:

Organization Name: .... Organization ID: .... Package: AnyRecordHierarchyv2 Version: 3.0 Error Message: The post install script failed.

What could go wrong? I installed this app yesterday on my dev org and it was working fine.

  • I would suggest to check with the developer of the app. That would be the quickest possible way.
    – manjit5190
    Jul 29 '20 at 7:08

Found solution! This issue occurs when user is not having MASS EMAIL permission. This leads to failing the Post installation script and opposing the package from installation.

Solution steps:

Setup -> Deliverability ->Change access level to All email. then try to install the package. Problem solved!

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