Updating PMP error: the file that you have specified is not compatible with this product

Updating PMP error: the file that you have specified is not compatible with this product

Running version 6600, trying to run the 6600 to 6700 update.  Run Update Manager with admin right and point to the file.  Error is:

"The file that you have specified is not compatible with this product"

The file C:\Program Files (x86)\PMP\conf\update_conf.xml confirms that we are running 6600.  How to resolve?
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