images are marked valid after they have been created successfully

Created an HTA of 2015 and receive the message when attempting to install.

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The Administrative image is not marked as valid: < dir path >

Images are marked valid after they have been created successfully, by updating the file .\\sldim\admin.dat.

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What in this file needs to be altered, and to what, to allow this image to be installed?

This has worked with SW 2013 and SW 2014 without error.

SolidworksAdministration