Error: “To run a ssis package outside of sql server data tools you must install [send successful email] of Integration Services or higher.”

Question

NOTE that the title of this qusetion is a verbatim error message specific to this user. The error message illustrates a bug in the dtexec application, which substitutes a user variable into the error message string. In this case, the standard message Standard E dition is replaced with send successful email.

The 'standard' error message would be :

Description: To run a SSIS package outside of Business Intelligence Development Studio you must install Standard Edition of Integration Services or higher.

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Version SSIS 2012. Package was originally 2005 ver. Package on file system.

DB Engine / Agent on Host 1, SSIS on Host 2.

Execution from Host 2 runs successfully. Execution from Host 1 gives the error in the question subject. Saw this post, but engine and agent are installed on Host 1. Has anyone seen this? Google returns no results when searching on the exact error (subject line is exact, wording is odd in the error message).

Thank you!