Acrobat Reader 15 DC: Updating via SCUP

I have Adobe Acrobat Reader DC installed on my Windows 10 workstations.  I keep them updated via SCCM using SCUP catalogs.  However, my installs seem to be stuck at version 15.020.20042 and don't seem to be updating beyond that.  I have the following Acrobat and Acrobat Reader catalogs provisioned in SCUP and am importing all of the available updates into my patching deployments:

Adobe Acrobat DC Classic Track:  http://armmf.adobe.com/manifest/arm-manifests/win/SCUP/AcrobatCatalog-2015.cab

Adobe Acrobat Reader DC Classic Track:  http://armmf.adobe.com/arm-manifests/win/SCUP/ReaderCatalog-2015.cab

Adobe Acrobat DC 2017 Classic Track:  https://armmf.adobe.com/arm-manifests/win/SCUP/AcrobatCatalog-2017.cab

Adobe Acrobat Reader DC 2017 Classic Track:  https://armmf.adobe.com/arm-manifests/win/SCUP/ReaderCatalog-2017.cab

Adobe Acrobat DC Classic Track Transition Catalog:  https://armmf.adobe.com/arm-manifests/win/SCUP/ReaderTransitionCatalog-2017.cab

Is there something I'm missing here?  I see the MUI versions of the updates in my list of available updates for Acrobat Reader, but nothing for the straight Reader DC install.  I'm trying the MUI install on a test machine now to see if that gets updates, but so far nothing is being detected.

Thanks,

--Aaron