Thanks, Aura!
I did as requested, and the CheckSur.log shows all four of those files were replaced by the SURT. I'm trying Windows Update again now, for SP1. (Out of curiosity, is there any good source to just retrieve these files when I find missing ones? Or does SysNative have an internal-only repository?)
Log follows:
Checking Component Store
(f) CSI Manifest All Zeros 0x00000000 winsxs\Manifests\amd64_microsoft-windows-activexcompat_31bf3856ad364e35_8.0.7600.20840_none_6da8ba2cad433007.manifest amd64_microsoft-windows-activexcompat_31bf3856ad364e35_8.0.7600.20840_none_6da8ba2cad433007
(fix) CSI Manifest All Zeros CSI File Replaced File: amd64_microsoft-windows-activexcompat_31bf3856ad364e35_8.0.7600.20840_none_6da8ba2cad433007.manifest From: C:\Windows\CheckSur\v1.0\windows6.1-7601-x64-clientcab4.cab
(f) CSI Manifest All Zeros 0x00000000 winsxs\Manifests\x86_microsoft-windows-activexcompat_31bf3856ad364e35_8.0.7600.20840_none_118a1ea8f4e5bed1.manifest x86_microsoft-windows-activexcompat_31bf3856ad364e35_8.0.7600.20840_none_118a1ea8f4e5bed1
(fix) CSI Manifest All Zeros CSI File Replaced File: x86_microsoft-windows-activexcompat_31bf3856ad364e35_8.0.7600.20840_none_118a1ea8f4e5bed1.manifest From: C:\Windows\CheckSur\v1.0\windows6.1-7601-x64-clientcab4.cab
(f) CSI Manifest All Zeros 0x00000000 winsxs\Manifests\amd64_microsoft-windows-activexcompat_31bf3856ad364e35_8.0.7600.16704_none_6d4e5e39940185d5.manifest amd64_microsoft-windows-activexcompat_31bf3856ad364e35_8.0.7600.16704_none_6d4e5e39940185d5
(fix) CSI Manifest All Zeros CSI File Replaced File: amd64_microsoft-windows-activexcompat_31bf3856ad364e35_8.0.7600.16704_none_6d4e5e39940185d5.manifest From: C:\Windows\CheckSur\v1.0\windows6.1-7601-x64-clientcab4.cab
(f) CSI Manifest All Zeros 0x00000000 winsxs\Manifests\x86_microsoft-windows-activexcompat_31bf3856ad364e35_8.0.7600.16704_none_112fc2b5dba4149f.manifest x86_microsoft-windows-activexcompat_31bf3856ad364e35_8.0.7600.16704_none_112fc2b5dba4149f
(fix) CSI Manifest All Zeros CSI File Replaced File: x86_microsoft-windows-activexcompat_31bf3856ad364e35_8.0.7600.16704_none_112fc2b5dba4149f.manifest From: C:\Windows\CheckSur\v1.0\windows6.1-7601-x64-clientcab4.cab
Summary:
Seconds executed: 913
Found 4 errors
Fixed 4 errors
CSI Manifest All Zeros Total count: 4
Fixed: CSI Manifest All Zeros. Total count: 4