SUU 753 Not Working on 2012 R2

I call suu.cmd to update my Dell servers during a post OS install configuration script.  Prior to the SUU 753 release everything had been working fine.  However, the most recent SUU repositories I've created for my build process now exhibits these messages for both the 32-bit and 64-bit SUU versions (this is on both 11th and 12th generation servers running a fresh installation of Windows Server 2012 R2 Update 1):

Reverting to an older repository that uses the SUU 752 plugin works fine.  My question is, where can I get the SUU_752.cab and SUU64_752.cab?  Repository Manager 2.1 does not automatically save older versions and I can't determine where to find this on the Dell FTP site.