The ActiveX SDK can be installed from ...\CoreSDK\SetupSDK.exe. This is headers, libs, core documents, samples, tools, etc. This also has RISC support, setup will detect your processer.
MVBRefs:
If you line InfoViewer and MVB files, execute \MVBRefs\SetupSDK.exe. Use the same install options and it will install right into your SDK installation. You can drag and drop ...\InetSDK\Help\ActiveX.mvb on InfoView.exe.
AXReDist:
Contains all of the redistributables. You can pick them out individually, or install them all on your system. The Zip file can be unzipped. The AXReDist.exe is a self extracting zip file. Make sure to execute it i.e. "AXReDist -d"
OLERefs:
OLERefs contains a zip file of the OLE References in HTML format. Warning, this will take 50MB of a FAT drive to install, 4+MB on NTFS. If you are using FAT, you probably should use the MVB files instead.