The error indicates a server side configuration error. All books (in ACS4) have a unique 'resource' ID (in GUID format). The download URL/.acsm file was pointing to a GUID that doesn't exist on the ACS4 server (E_ADEPT_RESOURCE_DOES_NOT_EXIST). The solution is either to re-issue the links to everyone with the correct resource ID, or to repackage the book with the resource ID that they actually gave to everyone. Either way it will need to be on the server side.
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