adobe dc pro install patch update to customized install

We are using a stand alone version of Adobe DC Pro (15.006.30033.2205) (no other Adobe products).  Windows 7 32-bit environment.  I have used the Adobe customization tool to create a custom install package.  I now need to update this package with the latest patch from Adobe to correct a recent security patch.

Ideally I'd like to make a new customized installer package as this allows us to disable the Adobe Sign-In feature, which our agency will never use.

I am trying to use:  msiexec /i acropro.msi PATCH="Acrobat2015Upd1500630280.msp" TRANSFORMS="AcroPro.mst" 

The .mst file was created by the customization tool.  However, when I run this command, I get the error:

"This patch package could not be opened.  Verify that the patch package exists and that you can access it, or contact the application vendor to verify that this is a valid Windows Installer patch package."

I have attempted uninstall and reboot and cleaning the registry of previous installation of Adobe DC Pro without any luck.

Can someone provide guidance on how to create a new customized install with the latest patch and still have the Adobe Sign-In option disabled?