Invalid version: The current version of the XFA template model exceeds the capability of Acrobat / Adobe Reader 8

[#1]

We are using AEM Forms 6.2 and the Designer that comes with it.  Designer sets the template target version to Acrobat/Adobe Reader 10 at the lowest.  Given that 10 is the lowest Acrobat/Adobe Reader version available why does AEM Forms 6.2 complain about exceeding Acrobat / Adobe Reader 8?

[#2]

I found this:

lcRenderSpec.PDFVersion = AdobeForms.PDFVersion.PDFVersion_1_7;

and this:

lcRenderSpec.acrobatVersion = AdobeForms.AcrobatVersion.auto;

The .Net component that calls the Forms Service was built referencing LC ES2.  Do we need to update the service reference to fix this?